Ideas for keeping dsg on

Ok, i need some assistance from all you knowledgable nurses out there. Just a little background. I have an elderly lady in the advanced stage of dementia. Diabetic,not very well controlled d/t her noncompliance with diet and meds. She can be behavorial with care, frequently refusing. Over the last 4-5 months,she has declined quickly and developed a gangerous toe. Well. to make a long story short she has had the second and third toe amp'ed. There is no circulation to the foot at all, despite anigograms and the like. Currenly she is on hospice care, but,her left foot needless to say is deteriorating very quickly. All of the toes and most of the foot is affected. My problem currently is the little darling will NOT keep a dressing on. She removes every dressing ive come up with to protect the foot. Ive wrapped with coban, ive tried ace wraps, ive tried 3-4 kerlexs, ive tried no kerlex, using minimal coverage. Nothing works! more concerned with her banging the foot than anything, i know healing isnt an option, or even at this point,staying the process. She is currently on scheduled roxanol,and a pretty hefty dosage at that. Difficult to asses, painwise r/t to the dementia,but will sit an PICK at her affected foot causing more damage! HELP!!! Besides keeping someone with her 24/7 im out of options. Does anyone have any ideas at all for something that will help me keep that foot dressed without restraining her hands? Thanks