Ahhh, i see you want justification for letting her back...
A professor on terrorism or more so ISIS, so i would say he has more expertise than the like of you and me, claimed that they should all be let back to their relevant countries and need to be removed from Syria. By doing so, they would then be held account to the judiciary system and could also be questioned, in regards to their knowledge and as such any criminal activities they have carried out.
He actually found them more of a risk by leaving them in Syria, rather than bringing them home and holding them to full account of the law. He went on to make specific comments in regards to Begum...
Stating on several occasions she was only 15! Now i know that will butt hurt you, but he repeated, she was 15 and naive, his words not mine, also remembering she has a baby (a completely innocent baby). The professor also commented that her husband married her at the age of 15, again questioning moral judgement of the Dutch man.
But hey i guess your intelligence is greater than that of a man whose field and expertise is terrorism...or is it that people of colour and of the religion muslim, should over-ride the judgement of an expert on the matter.