How do I go about getting my grandmother checked for dementia and having her moved to a nursing facility before she has been diagnosed?

My grandma is 78. She lived in her own home with my uncle until he passed away unexpectedly in November. I had been trying for years to get her to move into an assisted living facility but she would not. She was unable to properly clean the house and my uncle did not clean up after himself and the house was not livable and is still not livable. When he passed I could not leave her there and brought her home with me. My dad would not take her or help me with her, nor will my brother. I did not realize exactly how bad off she was mentally. I have taken her to her doctor and talked about what is going on and she blows me off. She has her on anxiety meds and now seroquel but nothing helps. She has delusions that people are talking about her, hiding her things, and that we hire a quartet to sing. She gets highly agitated and bangs on doors and wakes us up. She says I am going to have a deformed baby because I talk with witches and devil's. I don't know what to do anymore. I have an appt with a neurologist for her in March, that was as early as I could get it. She gets a social security check and does not qualify for Medicaid. Her home has a lien against it because she took a loan out in 2005 to do repairs and ended up losing her job due to layoffs that same year and she defaulted. She had filed bankruptcy and almost lost her home. They just got out of bankruptcy and she has a loan she pays on  475 every month and still owes $56k. I cannot afford to pay the difference of her bill if she went to a home. I don't know what to do. I work from home and I am going to lose my job because of the constant outbursts. She constantly packs her stuff up everyday and says she is leaving. I have called social services and they said they cannot do anything unless she is a threat to herself or others. I have had to go on blood pressure meds since taking care of her. I don't know what to do. She is falling more, I have taken her to the hospital because of her falling and talked to her Dr about it as well. When she gets in a state she will walk without her cane or walker. What do I do?