Police said it happened shortly after midnight on May 6 in the area of Winston Churchill Boulevard and Steeles Avenue West.
Officers said the victim was a passenger in a vehicle that had just left a business in the area and shortly after turning onto Winston Churchill, the driver pulled over so the passenger could get something from the trunk.
While the female victim was at the trunk, she was hit by another vehicle travelling in the same direction, police said.
She died at the scene.
Officers said a 56-year-old Mississauga woman was charged Thursday with careless driving causing death.
She’s scheduled to appear in court in October.