She was 15--a minor.
EM,
Please go on.
Are you suggesting she wasn't and isn't now a fanatic. Do you think she was brainwashed, or did she buy into the fanatical philosophy gladly?
This idea that people can be brainwashed suggests that everyone and anyone can be brainwashed, that is apart from the really wise ones who see that the rest of us as gullible fools therefor open to brainwashing.
Believing people can be brainwashed is convenient because it suggests your point of view is always correct, whilst people who take a contrary point of view have been brainwashed.
What is to be done with her, her husband, and their baby?
Do we really believe that no-one has a pre-disposition to genocide or mass murder in persuit of their own (brainwashed) notions, or if they have, is it possible to get them to change their minds, perhaps by another more liberal form of brainwashing.
I genuinely wish I could follow your throught processes on this, but there again, you may well be a Quaker or a Methodist or something else, who can see some good in even murderers. Whilst she may not have used the sword herself to severe a head from a body, I hope you'd agree, that by going there, she was involved in joint-enterprise. I find that hard to forgive.
I dimly recall at the time she left the UK to go to Syria that our TV screens were occupied by heads being severed from bodies, she'd be a rare creature not to have seen it too. Naive, ignorant, brainwashed?