Can we force mom off of our mortgage?

2-1/2 years ago, MIL gifted downpayment on our house. She now has moved in across the street. She is having financial trouble because she did a reverse mortgage on her high-end home, paid cash for the new little one, and now the old one isn't selling. She is in early dementia and has had a stroke in the past and is probably heading for a nursing home at some point down the line. We were in the same boat and were unable to sell our old house, which has been successfully rented, so she is on the title and the mortgage for the new one because at the time we didn't qualify on our own, but we do now. The agreement was for her to come off of the title and mortgage when we could refinance, but she is refusing now. I think she is afraid if she doesn't have control, we might move. Can we make her get off of the mortgage and title if we can refi? OR worst case scenario, can we make her take over the mortgage and we get off the title? I am worried that if she goes into a nursing home that our home will be counted as an asset of hers and we could be in danger of losing it. I don't want to keep paying this mortgage down if all is for naught; we have paid 75k already.