Police quoted a witness as saying that the girl, who was a worker of a foods shop, was crossing the road back from a noodle shop where she bough her lunch when she was hit.
The accident happened at 2:30 pm on the Pathum Thani-Bang Bua Thong Road in front of Parichart Housing Estate in Muang district.
Initially, only the lower half of her body was found in the dish in the middle of the road.
Later on, her upper half was found on the seat near the driver seat in the car, which was left about 10 kilometres from the scene. It crashed through the windshield and landed on the seat.
Police said the car has been stolen and the driver was fleeing.