Poor old Jean...
If she'd only read the safety card, she'd have known there were fuel tanks in the wing! She clearly didn't think at all! Any fule knows, it's clearly there on the safety card, that in the event of emergency the crew will remember to extend the flaps, that the wing isn't a safe place to stay because it's full of fuel, that right there where it says 'NO STEP' is where you're meant to jump off, and that a jump into pitch darkness of unknown height is perfectly safe. She clearly didn't think at all!
Alternatively, she did think. And she came to the wrong answer. She probably thought something was wrong, that the slide she had expected to be there wasn't; that in this day and age "you're meant to jump and hope" probably wasn't the recommended procedure, so something must be wrong and maybe she thought she would be helping the people behind by saying "this clearly isn't right, try another way."
Of course she was wrong. But it doesn't make her an idiot, it makes her a human. If it's human for a professionally trained pilot to have a fit of the quivers because the captain got seasick, then we should probably accept the passengers are at least as susceptible to moments of imperfection.
Maybe the solution is not to blame the SLF for being thick, maybe it's to ask if there is anything we can do to help them make better decisions. And if nobody listens to the safety briefing (something I suspect is massively overstated by cabin crew desperate to convince themselves their calling is higher than just selling scratchcards) then probably best to accept the briefings don't work and come up with something better, because moaning about it isn't going to change anything more than wishing pilots could recognise a stall will.