There’s a huge difference between a 15 year old falling for the temptation of drugs alcohol and attention, particularly growing up in difficult circumstances versus a 15 year old who travelled half way across the world to join a bloodthirsty terrorist organisation.
Drinking a bit of alcohol with friends is different to the sort of grooming of children some adults do, where they groom the children for criminal and sexual exploitation, often with alcohol, drugs, or expensive gifts involved.
One issue of CSE and CCE that's raised in safeguarding training is that the children don't consider themselves victims. They don't see that the adults that are their boyfriends/girlfriends/friends are actually groomers and manipulators who target children. They believe that they have a genuine romantic relationship/friendship. When speaking about the adults, the children will speak positively and speak like the relationship was a relationship of equals.
For someone like Shamima, who's been all over the press worldwide after being groomed by a terror group as a child and then lived through a war seeing the brutality of Isis first hand, she's likely to have buckets of trauma.
The girls in the Rotherham case were also blamed for being complicit in their own abuse too. It's a worrying trend to blame girls for being groomed by adults.
SB has committed crimes and is a British citizen. She needs to be put on trial in the UK and we have a responsibility to sort our own criminals out, especially when they were groomed on our soil as a child.