Annie Leung died in hospital early Wednesday morning after she was hit on Tuesday afternoon.
Mounties are looking for an older man with greying hair who was driving the black Ford F150 pickup truck with black canopy that left the scene after the girl was hit.
The driver pulled over after he struck the girl, but only for a moment, police say.
"The driver stopped briefly to look in the direction the victim was lying," said RCMP Const. Jamie Chung. "In that brief moment, we are not sure if he was distraught or not, but we know one thing for sure — he knew what he did."
Leung is one of three people killed or injured on Metro Vancouver roads in accidents on Tuesday afternoon.
A cyclist from Port Moody was pinned by a tractor-trailer rig on a busy route near a skating complex in Burnaby. Andrew Evoy, 51, was taken to hospital with serious injuries where he later died.
And a 13-year-old boy was hit by a car in Vancouver, but the driver of the vehicle stayed at the scene and the youth is now listed in stable condition in hospital.