I’ve seen this type of situation before. The basic idea is, the woman has low worldly awareness and isn’t in full control of her actions in that sort of state.

I had a student in my class who was over-dieting get up from her seat, walk towards the window absent mindedly, and fall over.

It’s a small implication but I think the fact that the person in the comic didn’t throw their hands out to stop the fall hinted to the flight attendant there was something very wrong with them beyond the turbulence.