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The removal of citizenship status did create extra problems for Ms Begum.... obviously? Given that she openly/willingly, or so it it seemed at the time (maybe not now though, given the latest thing about Canada's involvement) joined a terrorist organisation, then that was pretty obvious.
As I have said before the extenuating circumstances, (in my opinion) if there are any, would have been her age. 15 year old's tend to live in a world of their own, I know I did at that age.. if she she now renounces her decision then she should be given a chance. However renouncing her decision to join Isis is important in allowing the Home Office to come to a decision that she is no longer a danger to herself or others around her.
Not sure I understand that the second point has anything to do with her citizenship; presumably if you are suggesting someone is out to kill Ms Begum, then it wont make any difference whether she is a citizen or not?