The fact is, she's still a British citizen.
My own feeling is that she should be brought back under strictly controlled conditions, with her baby who no one would say is at fault here. She should be in custody and subject to investigation and attempts made to re-habilitate her if this looks like a possibility. I agree that what she has said is abhorrent but we cannot be sure of the danger she is in even now and how she has been affected by what she has experienced at a formative and vulnerable age. She was groomed, set off with friends as silly, impressionable young girls and goodness knows what happened to them in the intervening years. Some of what she's said sounds both confused and the result of serious conditioning. Her statement about severed heads in bins made me shudder as it did everyone else, but I think she's probably de-sensitised as Grammaretto suggests. No one is beyond redemption but I'm not naive enough to believe she should simply be reunited with her family without a long period of time in custody and facing trial if appropriate.
Horror affects all of us in ways we cannot imagine. The abused become apologists for their abusers. But by bringing her back, albeit under strict security, we could also learn more about how this tragedy came about and maybe - just maybe - how it could be prevented in future.