help! Harriet Houdini lives

Here's the problem. 96 year old demented woman fell and fractured her wrist. Off she goes to the ER. Comes back with a 1/2 cast wrapped with an ace bandage. That lasted less than 2 hours and off it went. (Yes, we all ducked when she threw it at us!) SO back she went to the ER ..got a full cast put on. That lasted 2 days. She pulled the cast off in one piece. Did the same with the second full cast. We have tried ace wraps, gerisleeves, long sleeved shirts, jackets (no, not straight ones!) and she manages to take off everything. Aside from restraining her 'good' hand, does anyone have any thoughts? She has pain meds, Ativan, Trazodone....what else could we do?