Hello childofchaos: I don't really have anything useful to offer here.

I presume it's not possible to simply get rid of those bags your mother is using & replace them with something more sanitary? (I realize this is probably just one problem among many.) I presume as well you've looked into the possibility of low income housing. I know it can be very difficult to get into this sort of thing, if it's even available.
I'm an older person myself. (Close to your mother's age.) So I know how difficult we older folks can be.

I just wanted to leave a note letting you know I read your post & wishing you the best with your efforts to work through this most difficult situation.