She does comes across as very hard, cold and arrogant in that interview. But I think she's being very, very careful not to aggravate the other jihadis around her. After all, she's still in Syria and could be attacked for expressing anti-Isis views.

She's obviously been indoctrinated, manipulated and radicalised most thoroughly.

She makes me think of a cornered animal, wary, defiant and 'tough' but in reality trembling with fear and desperately looking for a way of escape.
By showing her care, kindness and reassurance, (while of course going through the due processes of Law in UK) she will have more chance of seeing that 'our' side of things is less barbaric, murderous and wicked than 'hers'.