My mom has alienated everyone in her life. We haven't asked, but she wouldn't agree to pay for care, even if someone comes to her place (yes she has it, she just won't admit it). She also refuses to keep up daily chores so she can't maintain any reasonable quality of life for herself BY herself. We have saved her from eviction twice already and she's letting her place go again. She would not be cooperative either if the subject of POA were brought up. My brother and I need help. She's not making clear decisions or judgments so we're very concerned for her mental health. We need to know what control we can assume on her behalf, if she is not agreeable. Can we take over her care & finances if she refuses to allow us to help? We feel so helpless. We don't know what to do :(
https://blogs.findlaw.com/law_and_life/2013/09/legal-how-to-declaring-someone-incompetent.html
As JoAnn said... likely to be expensive due to needing a lawyer to guide you through the legal process.
You will need guardianship but that is expensive. I think you can use her money for it.
You may need to wait until she has a serious fall or illness that sends her to the hospital. When that happens, you talk to the discharge planners about what the conditions are like at her home and that there is no one to help her there.