I think back to "Typhoid" Mary Mallon..... (understanding that such is completely indefensible today)
But yes, you are all right about what I am suggesting, morally and legally. All I'm getting at is that "she's worth more to us alive."
I agree with her value 100%. The problem, and its a good problem, is that you may never really be able to extract that value. I would be that she would be a wealth of information in terms of how people get radicalized and what we might do to prevent it.
As for the Typhoid marry, there were some things that made it different. They did try and let her go with stipulations that she could not do some jobs due to her risk. She was caught infecting people because she went back to cooking again. So a little different, but, not so different that your point is missed.