Assuming no foul play, if she opened/broke her front window and water flooded in while at same time car the starts tipping forward then I think the natural reaction would be to just scramble upwards following the trapped air towards back of car (and she would fit through the gap into the ‘trunk’ area) hoping she will either be able to somehow break out or be rescued before the air left disperses
One thing that confuses me if it the car went in front first and then the back tipped over due to the front sinking / weight of engine plus motion of the wheels (as the theory states), then in the recovery and while under water the car was somehow flipped the right way up and other way around hence pulled out backwards?
Or did it go in frontwards and flip side over somehow, or go in backwards and some how flip upside down?
I can’t see how they could turn a car right way up and turn it around to face opp direction under water without a lot of commotion on the tow ropes and risking losing any evidence?