Talk to an attorney, maybe even her attorney, and see if you can seek guardianship of her, either temporarily or perhaps permanently. I had to do this with my grandmother who developed dementia because her son (my uncle) lived with her and was trying to talk her into signing her house over to him. She had been exhibited other signs of dementia, like paying bills twice, writing down lists of people and phone numbers, forgetting I had been there for lunch earlier, etc.
For me, it was a very straightforward process. We met with her lawyer, he asked her some questions, she gave some incorrect answers (like "How is your daughter doing?" My grandmother said fine, even though my mom was on a walker with RA; she called me by my uncle's name in the meeting.) The lawyer agreed she was not able to fully take care of herself, I met him in court in front of a judge, the judge asked me a few questions about accepting responsibility for my grandma, and a temporary guardianship was granted. That was automatically changed to permanent after 60 days. My grandma didn't have to go to court, I guess because of the lawyer's statement that he agreed she was incompetent.
It's a big responsibility to "takeover" a person like this, but it's also sometimes necessary to protect them. IANAL, but my understanding is a Power of Attorney grants you privileges of the other person, but they still have them too. Whereas guardianship gives you the rights and removes them from the person. Guardianship doesn't have to be permanent, though maybe in this case, that's warranted.
One important note: make sure your mother's will is the way she wants it before you do the guardianship, because once that is done, the will cannot be changed. My grandma's attorney never took this step with me, he had drawn up her will, and it contained errors that could not be fixed after the guardianship was granted. We were lucky that things worked out okay, but if my mom had died before my uncle, all of my grandma's assets would have gone to him, with none going to my mom's side of the family, and we were the ones taking care of her! "Per stirpes" was omitted in the will. Two words -- huge difference in meaning.
For me, it was a very straightforward process. We met with her lawyer, he asked her some questions, she gave some incorrect answers (like "How is your daughter doing?" My grandmother said fine, even though my mom was on a walker with RA; she called me by my uncle's name in the meeting.) The lawyer agreed she was not able to fully take care of herself, I met him in court in front of a judge, the judge asked me a few questions about accepting responsibility for my grandma, and a temporary guardianship was granted. That was automatically changed to permanent after 60 days. My grandma didn't have to go to court, I guess because of the lawyer's statement that he agreed she was incompetent.
It's a big responsibility to "takeover" a person like this, but it's also sometimes necessary to protect them. IANAL, but my understanding is a Power of Attorney grants you privileges of the other person, but they still have them too. Whereas guardianship gives you the rights and removes them from the person. Guardianship doesn't have to be permanent, though maybe in this case, that's warranted.