Aria Thorpe died after suffering a single stab wound on Monday, Avon and Somerset Police said.
Emergency services were called to Lime Close in Weston-super-Mare, Somerset, at 6.09pm but Aria was pronounced dead at the scene.
A 15-year-old boy, who cannot be named because of his age, appeared at Bristol Magistrates' Court on Wednesday charged with her murder.
During a brief hearing, he spoke only to confirm his name, address and date of birth.
He was remanded into youth detention accommodation ahead of a hearing at Bristol Crown Court on Friday.
A police cordon remains in place at the scene of Aria's death as forensics officers continue their work.
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Superintendent Jen Appleford, from Avon and Somerset Police, said the community was in shock and Aria's family were being supported by police.
"It is impossible to adequately describe how traumatic the past 36 hours have been for them and we'd like to reiterate in the strongest possible terms their request for privacy," she said.
Supt Appleford said police were working with local schools and other agencies to make sure support is available.
Charles James Spencer-Churchill, a relative of Sir Winston Churchill and Diana, Princess of Wales, is accused of three offences between November 2022 and May 2024, Thames Valley Police said.
The 70-year-old has been summonsed to appear at Oxford Magistrates' Court on Thursday, following his arrest in May last year.
The three charges of non-fatal intentional strangulation are alleged to have taken place in Woodstock, Oxfordshire, against the same person.
Spencer-Churchill, known to his family as Jamie, is the 12th Duke of Marlborough and a member of one of Britain's most aristocratic families.
He is well known to have battled with drug addiction in the past.
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Spencer-Churchill inherited his dukedom in 2014, following the death of his father, the 11th Duke of Marlborough.
Prior to this, the twice-married Spencer-Churchill was the Marquess of Blandford, and also known as Jamie Blandford.
His ancestral family home is Sir Winston's birthplace, the 300-year-old Blenheim Palace in Woodstock.
But the duke does not own the 18th-century baroque palace - and has no role in the running of the residence and vast estate.
The palace is a Unesco World Heritage Site and a popular visitor attraction with parklands designed by "Capability" Brown.
In 1994, the late duke brought legal action to ensure his son and heir would not be able to take control of the family seat.
Blenheim is owned and managed by the Blenheim Palace Heritage Foundation.
A spokesperson for the foundation said: "Blenheim Palace Heritage Foundation is aware legal proceedings have been brought against the Duke of Marlborough.
"The foundation is unable to comment on the charges, which relate to the duke's personal conduct and private life, and which are subject to live, criminal proceedings.
"The foundation is not owned or managed by the Duke of Marlborough, but by independent entities run by boards of trustees."
The King hosted a reception at Blenheim Palace for European leaders in July last year, and the Queen, then the Duchess of Cornwall, joined Spencer-Churchill for the reveal of a bust of Sir Winston in the Blenheim grounds in 2015.
The palace was also the scene of the theft of a £4.75m golden toilet in 2019 after thieves smashed their way into the palace during a heist.
The duke's representatives have been approached for comment.
Researchers used a simple blood test to search for biomarkers associated with the development of dementia.
The study also found more than one in 10 people over the age of 70 would meet the criteria for drugs that can slow down the early stages of Alzheimer's.
Researchers at King's College London, University of Gothenburg and Stavanger University Hospital analysed 11,486 blood samples provided by people over the age of 57 taking part in the Trondelag Health Study (HUNT) in Norway.
They looked for how regularly proteins in the blood that have been linked to cognitive impairment came up, or the gradual deterioration in thinking, memory and reasoning.
The frequency of Alzheimer's disease neuropathological changes (ADNC) - deposits of proteins in the brain that lead to the death of nerve cells - grew with age, according to the analysis.
The study found it was higher in older people, but lower than previously estimated in the younger groups.
ADNC was present in fewer than 8% of those aged 65-69, jumping to 65.2% in patients over the age of 90.
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In people over 70, the study found 10% had symptomless pre-clinical Alzheimer's disease, while 9.8% had Alzheimer's dementia.
Some 10.4% had prodromal Alzheimer's, the stage between pre-clinical and dementia, when memory and thinking problems due to cognitive impairment are noticeable.
Researchers suggest 11% of the over-70s group would be eligible for antibody treatments, which slow down the early stages of Alzheimer's.
These drugs include lecanemab and donanemab, which are licensed for UK use but will not be made available on the NHS after the spending watchdog argued their benefits are "too small" to justify the cost.
Researchers also found ADNC "was more prevalent in individuals with lower education".
Dr Richard Oakley, associate director of research and innovation at Alzheimer's Society, said: "This is the first time we've seen this type of data from such a large group of people, with over 11,000 blood samples analysed.
"It is a stark reminder of the scale of dementia. We already know it's the UK's biggest killer, but its impact may be even bigger than we think."
He added: "Blood tests could transform how Alzheimer's disease is diagnosed. They are quicker, cheaper and can be easier for patients than scans or lumbar punctures. Ultimately, these tests could help many more people get a diagnosis earlier."
Blood tests to diagnose Alzheimer's are also not available on the NHS.
Doctors currently use lumbar punctures or PET scans to test for ADNC.
But a trial announced in September will recruit 1,100 people from memory clinics to investigate how well a blood test works on the health service, with results expected in three years.
Dag Aarsland, a professor of old age psychiatry at King's Institute of Psychiatry, Psychology & Neuroscience (IoPPN), said of the Trondelag Health Study findings: "If we are to meet this global challenge, it is vital that we are able to detect signs of dementia at the earliest possible stages.
"This blood test looks to be an effective means of providing that clarity at scale."
Grant Hunter, 34, fatally shot Marc Webley, 38, outside The Anchor Inn in Edinburgh shortly before midnight on 31 December 2023.
Webley, who had a history of involvement in gangland violence, had earlier taunted his rivals on social media and dared them to "come and get it".
Hunter last month pleaded guilty to the murder, with the High Court in Edinburgh hearing how he carried out the hit on "behalf of others" who were "unknown" to police.
He also admitted attempting to murder Stewart Pearson, who survived after being shot in the attack.
The killer was handed a life sentence with at least 26 years behind bars at the High Court in Glasgow on Wednesday.
Judge Lord Mulholland told Hunter he had committed murder for financial gain and for the "furtherance of serious organised crime".
He added: "Your cowardly actions will haunt you for the rest of your life."
Hunter was previously described as a "paid assassin" by Lord Mulholland.
On conviction, he told Hunter that the streets of Edinburgh and Scotland were not "war zones", adding: "They are not Chicago in the 1930s."
CCTV showed Hunter parking a stolen Hyundai Tucson car outside the pub before approaching Mr Webley and Mr Pearson. After a brief encounter, Hunter pulled out a gun and shot at both men.
The initial shots missed Mr Webley, but Mr Pearson was struck by a bullet and fell to the roadway. He has since made a full recovery.
Webley, who was wearing a stab-proof vest, was shot in the back as he attempted to flee and was later pronounced dead at hospital.
Lord Mulholland stated that the shots fired at Mr Webley "showed beyond any doubt that you wanted him dead".
Hunter fled the scene but was arrested days later. The murder weapon has never been recovered.
A witness who was in the company of Hunter that New Year's Day told police the killer was making jokes about Mr Webley "not seeing the bells" and reportedly said he pulled his mask down so the victim "knew who had done it to him".
The judge stated it was "sinister" Hunter wanted his victim to see his face but said it was ultimately his "undoing" as he was subsequently recognised by police officers and members of the public who knew him.
Hunter was said to have shown "no remorse" for his actions.
Lord Mulholland stated that the public and the courts "will not put up with this gangsterism".
Hunter's former partner Emma McVie, 27, and Gary Robertson, 22, also admitted their involvement in the case by attempting to pervert the course of justice.
McVie, who travelled in the stolen vehicle with Hunter to the crime scene, cleaned the getaway car and the clothes they were wearing.
Robertson disposed of the gun, and supplied cash, cocaine and a change of clothing to the pair.
McVie was jailed for four-and-a-half years, while Robertson was sentenced to six-and-a-half years in prison.
Moira Orr, procurator fiscal at the Crown Office and Procurator Fiscal Service (COPFS), said: "Marc Webley's murder was a targeted shooting carried out by Grant Hunter on Hogmanay during a time when many people would have been out celebrating.
"This shocking incident cost one man his life and endangered the life of another, who also suffered a gunshot wound.
"Overall, Hunter's actions put the lives of the public in serious danger.
"This conviction should send a strong message to others involved in this kind of criminal behaviour - you cannot hide from justice, and we will use all the tools available to us as we strive to keep the communities we serve safe."
Harry and Megan Tooze were found dead in a cowshed with gunshot wounds at their farm in Llanharry, near Cardiff, Wales, on 26 July 1993.
South Wales Police began a forensic review of the case in 2023 in the hopes of uncovering new evidence in the murders of Mr Tooze, 64, and Mrs Tooze, 67.
The force arrested a man on Wednesday and he is currently in police custody.
Detective superintendent Mark Lewis said: "While this arrest is clearly a significant development in the investigation, our inquiries are very much ongoing.
"This case has affected many people over the years, and our aim is to find the answers to the unanswered questions which remain about their deaths over 30 years on.
"Even with this passage of time, I appeal to anyone who has any information about the murders to come forward and speak to police."
The couple's last known whereabouts was when they left their house to collect their pensions in Llanharry on the morning of 26 July 1993.
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Neighbours reported hearing two gun shots at around 1.30pm.
However, emergency services were not alerted due to the noise being considered normal on a rural farm.
Police were called and attended the Ty Ar y Waun farm and discovered the bodies of the couple in a cow shed after a regular phone call from their daughter went unanswered.