I found this Q & A helpful, from Marsha Kay Seff:
Q: My 95-year-old mother-in-law refuses to move to a safe and protective environment of assisted living. How do we get her placed when she is so stubborn? She also refuses help in the home. I need help as soon as possible. We have taken her to several places, but she still says no.
A: Unless you have her declared incompetent (difficult and expensive), you can't force her to move. It sounds as if you could use some professional help. For free counseling agencies, check with your local area's Agency on Aging. Some mediation agencies help families for no cost.
The truth is, sometimes you have to use some tough love: I love you, Mom, but I can no longer visit you when I'm so worried about you being unsafe alone in your home.
And sometimes you need to go a step farther: Mom, I'm going to have to call Adult Protective Services or the district attorney, because you're unsafe in your house and need protection.
Then, you could try fudging: Mom, if anything happens to you, I'm afraid I might be charged with neglect.
The way I figure it, we all do what we have to do to keep our parents safe.
I hope you found this helpful. :-)