Could she not have opened the door or rolled down the window? The article made sure we knew that she went to Harvard and described the event she was attending, but no mention of why she was unable to exit the vehicle. Did she not know how to swim? Was their some obstruction? Did something malfunction? Was she so used to having other people do things for her that it just never occurred to her to do anything for herself?

It’s pretty much impossible to open a car door underwater. You’d need superhuman strength.

As to why the windows didn’t roll down, I can only speculate.

Depends. You have to wait for the pressure to equalize to open the door. So once the car is filled up fully will you be able to open it. The problem is if you drove a car into a body of water, you might be panicking and not thinking through your actions