Did people feel as sympathetic for Jon Venables and Robert Thompson who were 10 when they brutally murdered James Bulger??
People who feel sorry for her are seeing her as they view their own children or children you know. She is very different because the average child doesn't have the kind of hatred in her where blowing up people and war seemed attractive.
This wasn't the sort of 'grooming' where all children want is love, attention, romance that paedophiles give them. It isn't even a case of children in war torn countries who join rebel groups to stay alive, or are forced into it. Or even kids who grow up in estates and get blackmailed/forced into joining gangs or face being bullied/terrorised/alienated from friends.
She had none of those pressures. And she was aware of the cause she was joining - not based in patriotism or survival, but a bloodlust and fanaticism. She may have been 15, but she was old enough to know death and terrorism and the difference between right and wrong. She knew other children were dying as a result of the terrorism, and she still wanted to be a part of it.
I have no sympathy for her. If she hadn't been caught or punished, who knows how many lives would be ended because of her. Terrorism isn't a joke, and the people who believe in it are not reasonable or rational - they don't value life in the same way. And that goes for British children who give up the comforts of their home to join this reign of terror.
Of course, she seems sympathetic now because her plan didn't work! If it had, there's be death surrounding her.