I had assumed that she'd been assisted out of aircraft and had then been forgotten/abandoned and subsequently run over. If she flew there outside the aircraft, then having made her way forward of the wing, it does imply that her outlook was rather bleaker.
Given the damage to the rear of the aircraft, it's also not completely impossible that she could still have been ejected while wearing a seatbelt. And... being foolishly unsecured in no way justifies a death sentence… do we see a cabin crew as lax as the flight crew?
I have a great deal of sympathy for the general rescue firefighter's position, traveling to the accident at 80mph in a 60 ton truck. They stand with the ability to potentially save hundreds of lives on the very rare occasion they are called, and never see a real live event in training. With time of the essence, road accidents sometimes occur on the way to regular city fires too.