The whole situation is very complicated for sure. She didn't become a terrorist's wife by accident after all. She apparently holds some pretty horrible views and has clearly made some awful decisions, not least of all trying to raise two children in a war zone. How much blame you can attribute to her versus the many people who have been influencing her I don't know.
I can't say I'd be happy to see her at the school gate, but I'm not sure it could be considered justice to ban her from the UK either.