I'm not sure they met online before she went out there. Do you have a source for that? Because I've see not seen her claim that, and everything I have read says they first met after she arrived.
I'm not suggesting it was OK for him to marry a child after she arrived, but that's not the same thing as grooming her to travel out there.
You seem to be inventing facts to support your position that she was somehow tricked/ manipulated into going, rather than choosing to do so because she believed in what IS were doing.
It's possible to disagree with this law, and even the way it's been applied, without making stuff up to absolve her.