Lisa Batstone, 41, was charged Thursday morning, the Integrated Homicide Investigation Team (IHIT) confirmed.
Batstone, who has no other children, will be appearing in Surrey Court today, IHIT said in a release.
The cause of death has not been confirmed and an autopsy is scheduled for today.
Shortly after noon PT Wednesday, Surrey RCMP responded to a report of a "suspicious circumstance" in the 13900 block of 35A Avenue of Surrey. Police initially believed it was a minor motor vehicle accident when they found a car stuck in a ditch in a rural area.
The body of the child was then discovered in the trunk of the car.