The scooter and a car collided on Wanneroo Road in Wanneroo just after 2pm on March 28.
“The girl was treated by St John Ambulance and taken to hospital for treatment of serious injuries,” a police spokesperson said at the time.
The car’s driver was uninjured. On Thursday afternoon,a week after the crash,police confirmed the girl had died as a result of her injuries.
An investigation remains ongoing through the police major crash investigation section.
Anyone with information should call Crime Stoppers on 1800 333 000.
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