The really cool part of this is that the law has been in effect for 40 years. Yet nothing on the slippery slope you doomsay about happened. The gov website says around 20 people get hit by it every year. Another 20 for fraud charges. Yet it hasn’t been a problem. There is the appeals court for it. The only reason we talk about this is that a tale of a “poor innocent child being stolen away from the UK returning and being denied citizenship” sounds great for clickbait in a “news” article.
The reality is, she went to join ISIS willingly. Now she is paying the price for it.