This debate does all hinge on our attitude to a Muslim girl
No. This debate hinges on a woman who, with free will and cunning, left her family and country to join a proscribed organisation in Syria. She freely admitted to having witnessed atrocities that, for most of us, would turn our stomachs but, for her, she "wasn't fazed." She was an active member of the ISIS morality police which, from what little we know, issued punitive and cruel punishments to any woman who was deemed to be "inappropriately dressed". At interview she confirmed that she had no regrets or remorse for what she was implicated in; a fact that her own father condemned. When asked about the 22 young people who had been murdered in the Manchester Arena bombing, she again had neither sympathy nor contrition.
In short, this woman demonstrated arrogance and zero regret for her actions until it became obvious that her attitude was alienating her still further from the British public, and it was hindering her hopes of returning. She has shown a remorseless, arrogant and calculating disposition which has alienated her from family members.
But, she is no better, and no worse, than all the other people who decided to make a future within ISIS and they have come from all walks of life, all ages, all colours. So be off with your dog whistle tactics and cheap claims of "its only because she's a Muslim with brown skin" nonsense; it's her actions and attitudes that have caused such revulsion, disgust and outrage.
But for all my dislike of this woman, and disgust with all that she's done, she is British and she is our problem and regrettably, we do have to accept her back into the country she reviles and willingly left. Justice must be seen to be done and we cannot shirk our responsibility by leaving our problems for another country to deal with.