When she was in the car and there was still flames and smoke she inhaled all that smoke. Although it could be said she died in a fire...or because of a fire, I suspect what really killed her was inhaling all that smoke.
Your body does shit to save itself during this times that you have no control of. The nervous system is very active at this moment. When she pops up like a jack in the box reminds me of what I experienced when having my last heart attack.
I'd be in a deep sleep and suddenly pop up straight in bed....just like you see her do in that video. It's because you are drowning. Your lungs fill with fluids and you can't catch your breath. When you are upright its not as noticeable, but when you are laying down it's impossible to get air.
The problem is the heart can't pump enough and it's what is known as congestive heart failure. The heart fills up with fluid and overflows into the lungs filling them up with fluids.
.................................................................................................................................................................................................
Heart Failure
In
congestive heart failure, the heart becomes less effective at pumping blood, which can lead to fluid buildup in the lungs and other parts of the body. The excess fluid can create congestion and trouble breathing, especially
when lying down. As a result, people with congestive heart failure may gasp for breath during sleep.