This is the first definite confirmation that I've seen which states that the girl who was hit by the fire truck was located in front of the wing (relatively near the slide), rather than behind the plane where those who were ejected ended up.
ID emerges of third girl to die of SF plane crash - SFGate
I have to wonder if she came down the slide (perhaps injured) and collapsed/was overcome/passed out. Of course, it's possible someone carried her down the slide.