That part made perfect sense to me. Watching this girl was taking resources away, and if she was determined to kill herself, it was GOING to happen. No one can watch her 24/7, she'd find a free moment. This was just focring the issue, the 'shit or get off the pot' moment. Either she does it, and the group can stop wasting time and manpower, or she realizes she wants to live, and it's over.
I hope you would think differently if it was someone from your family that wanted to commit suicide.