@runningawaywiththecircus is correct.
If her citizenship is eventually reinstated, it’s very different to ‘giving her another chance.’ Imagine the headlines if that was the decision of security services, and she went on to perpetrate a terror attack on British soil. This is not an individual who can ever be allowed to walk the streets. Remember, terrorists only have to make it work once, security services have to get it right every single time. There are methods of dealing with high risk individuals, but people often disagree with them on the basis that it’s not following international human rights law.
Deradicalisation programs are extremely high risk. We categorically do not have sufficient data to understand whether they work. I wouldn’t want my children to be near her even afterwards, and so what right does the government have to demand that of the public?
To want this individual to be reintegrated and openly allowed into society is kind, but it’s also said from a position of privilege. People who have lost loved ones to terror attacks, people who have life limiting injuries as a result, the traumatized people of Syria who lived in ISIS controlled land. If that risk was posed to you, wouldn’t you do everything to avoid it? I’m thankful that this will, in the end, be a security based decision. However, to maintain that, security services desperately need more investment and further integration (domestic-international).