She's there for as long as the Kurds hold her or until she escapes like her pal Sharmeena did. She doesn't have to come back to the UK to be a threat to its security.She’s not free though, is she? She’s stuck in a camp in Syria and can’t come back. IMO, the longer she’s there I think the more the government can say she’s probably been radicalised further and presents a bigger risk. Government Legal Department lawyers must be pretty sure of themselves if they’re prepared to keep going with this.
Just seems a strange risk to take if she's so dangerous. Keep your friends close and your enemies closer.