November’s child safeguarding practice review found Sara had “effectively disappeared” once she was home -schooled.
Her former school gave the council Sara’s new address in Woking so workers could make a home visit as required by its home-schooling policy, but the system was not updated.
It meant that when the home education team went to her old address when they tried to visit on 7 August 2023 – the day before she was murdered.
Sara was hooded, burned and beaten during the campaign of abuse.
The review said a post-mortem examination found she had suffered dozens of injuries – and bruising was first noticed in June 2022.
It was commissioned by the Surrey Safeguarding Children Partnership, which is made up of police, local health organisations and the council’s children’s services.