One thing I don’t understand is, why was Kennedy able to exit the car, but not Mary Jo? And how could the car have maintained a bubble of air, after Kennedy had opened the door or broken the window, or however he exited the car? It seems like the water would have rushed in at that time.
It wasn’t a deep pond. It wasn’t far to shore. Why was she not able to exit the same way as Teddy? The car wasn’t that badly damaged. She was at the air pocket.
I’d say she was disoriented and panicked. The air pocket proves she was alive for some time.
She was definitely able to be rescued.