I didn't know about this documentary and it sounds interesting so thanks for the rec ! I'm especially interested as I was living in Turkey back when the whole thing hit the news.
Personally I find it hard to empathize with Shamima. I could believe that a girl could be deceived and somehow manage to glamorize the whole thing. But when she arrived there, she saw first hand the pain, torture and misery of it, and she still believed in it. She didn't try to help any of the others, any of the prisoners. She was even quoted as saying she "had a good time".
So I'm not sure I can believe fully the "she was groomed" excuse.
There was a boy who was groomed by his mother in law to kill his own father. So I know grooming can and does make people do awful things. However the boy's remorse in the documentary that was made about him was very raw and real and sincere. And also grooming usually involves a relationship (often abusive) with one specific person but my understanding is that Shamima was given to her husband (so she wasn't living with her groomer) yet still away from the groomer's influence she found it all perfectly fine.
Furthermore, whether or not she was groomed as a child is at this point irrelevant, the question is whether she believes in ISIS as an adult. The evidence so far suggests that she does, and only says anything to the contrary to get what she wants.
As for the baby it is tragic, and I do think the UK should have tried to repatriate it, however to be fair they didn't have much time to organize any transfer as the baby died very quickly. Also, what should they have done if Shamima refused to hand him over ? Obviously we'll never know whether she would have, but a reason they didn't try may have been that she would have tried to use the offer to negotiate her own return, which was not on the table.
In any case, the baby was also Dutch, wasn't he, since the dad was Dutch. Yet no one here suggests the Netherlands should have made any efforts to repatriate him.
Sorry but I can't feel bad about Shamima's fate. Criminals are one thing, terrorists quite another. However, I'll watch the documentary and we'll see if I change my mind !