She clipped a car towing a caravan and then collided head-on with a Jeep.
The 63-year-old from Wonthaggi, south of Melbourne, died at the scene.
The nine-year-old boy in the car was airlifted to hospital with non-life-threatening injuries.
A man and woman in the car towing the caravan, were not injured.
The man driving the Jeep was taken to hospital with minor injuries.
Police are investigating the exact circumstances around the collision and investigations are ongoing.