It’s really difficult to help provide care to a person who has cognitive decline when they are resistant. The trouble is that she likely will not be able to understand why it’s not safe for her to live alone with her memory issues. I have encountered it with a couple of my family members.

I might suggest that you or another family member visit with her for a few days in order to observe and take notes of just how well she’s functioning. And, chat with neighbors and friends to see what input they might have. Will she allow you to attend a doctor’s visit with her? With that information, I’d consult with an Elder Law attorney in her jurisdiction. They can provide you with options. Sometimes legal action is necessary to gain control over the person and make decisions about where they live. It’s a very difficult situation. Good luck with whatever you decide.