But the question was how would you handle her.
And the simple answer I guess is in our airline it is not even mentioned in any form of training. Let the damn crew deal with it once she is on board, as then its not the ground staffs problem anymore.
To be fair the airlines are damned if they do, damned if they donr. Yet people with mental health issues pose a very real threat to the aircraft. I have personally experienced mentally unwell pax trying to open doors in-flight. And to those saying they are designed so that cant occur. Well yeah it can if some crazy b#@ch decides at 500 feet she needs to get off and runs at the door and grabs the handle trying to open it. No aircraft pressurisation = door will open. Not a good time for it to happen either. I had to sit on her for about 10 mins till other crew could come to my assistance.