Officers said three teenage boys allegedly approached the car and threatened her with a knife, before demanding she get out of the car.
The 42-year-old woman wasn’t physically injured.
The three boys allegedly entered the Porsche SUV and sped off.
Police said the car allegedly crashed into a Holden utility on Main Street shortly after.
The boys allegedly ran from the scene.
Police arrested three teenage boys, aged 13, 14 and 15, at a home in Toukley about 2pm.
All three have since been charged with aggravated assault with intent to take or drive a motor vehicle while armed with a weapon.
The youngest boy was charged with driving unlicensed.
The trio were refused bail and will appear before a childrens court today.