Police have said they are examining the "culpability of all parties" involved after a seven-year-old girl died following a collision on her quad bike.
Elizabeth Cooke and her brother Jack, 10, were riding quad bikes behind their father Gary's Range Rover near the family home in Blackmore, Essex.
Elizabeth died in hospital from internal injuries following the collision on Boxing Day.
A 28-year-old woman, from the Brentwood area has been arrested over the crash.
Police said Elizabeth's quad bike was in collision with a Range Rover, driven by a 28-year-old woman from the Brentwood area, shortly after 1800 GMT.
Post-mortem tests
The crash occurred in Fingrith Hall Lane, just outside the village of Blackmore.
An Essex Police spokeswoman said officers were continuing to investigate the accident and added: "We are making further inquiries and examining the culpability of all involved parties."
The 28-year-old woman, who has not been named, could be charged with careless driving.
A pathologist is carrying a post-mortem examination to establish how Elizabeth died.
Police said she had been taken home, about half a mile from the crash scene, after the accident.
Paramedics went to the home after her family called the emergency services to say she was ill.
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