Surely this is all about the government 'making an example' to try to put off others who may, in the future, be tempted to follow the same/similar path.
I think most people agree that at 15 years old, effective and considered decision -making is not part of many teenagers skill sets; however it would appear that Shamina Begun even when she was faced with reality continued in the life she had chosen, regrets only seemed to have entered her mind when IS began to fall apart.
Eventually the Government will have to take a decision based either on human rights, as many consider it should, or because it has strung out the agony, long enough and has shown its determination not to roll over on such matters.
The next stage then when her citizenship is restored, will be deciding what to do with her?