Police say she was a passenger on a motorcycle when it was struck by a car making a left turn in an intersection (on 122 Street) at about 8:15 p.m.
A 24-year-old man driving the motorcycle is in hospital in serious condition with non-life threatening injuries.
Police say both victims were wearing helmets at the time.
Witness reports helped police find a 60-year-old male suspect in west Edmonton. He was taken into custody and police say charges are pending.
No names have been released.