The problem isn’t just SB, as I understand it there are already about 400 IS returners now in the UK. We also allow people into the UK without sufficient checks on their backgrounds, I’m thinking of the Manchester Arena bomber, who wasn’t even a British citizen but was allowed to arrive and live here. I think he was from Libya, please correct if wrong.
I think, but again correct if I’m wrong, but I think we cannot charge people who commit crimes abroad in this country. If SB was to be charged, she would need to be charged in Syria, where she committed any crimes, if indeed she did commit crimes.
Unpalatable as it might be, we have a duty towards her as a citizen of the UK. I have no sympathy towards her, I’d rather she didn’t come back (along with all the others who already have returned) but I recognise the obligations of the UK.