Did you listen to the recording of her interview this morning? Showed no signs of regret for what she did and basically said the reason she wanted to return to Britain is that her third child which is due shortly (her two first children both died in Syria) would "be cared for medically at least".
If we allowed her to come back in, the chances are her unborn child would be brought up radicalised and who knows, she could spend her time radicalising other young girls. She obviously still believes in the cause.
If she returns I can’t imagine Social services Wouldnt have to consider the welfare of her child and how suitable she is to care for that child .