What shall I do with Mom?

She has dementia, not too advance, but she consider me as an enemy cursing and yelling all day. Her dementia is advancing pretty fast in the last 4 month. Mom is just yelling, sometimes even 13h per day at me, she wants to go back home. That home does not exist anymore, she has nowhere to go. I am the only child and relative she has. Latest she was threatening to put the house on fire, and brake everything what is in the house. She is very verbally aggressive. Can barely walk anymore. I tried all options I new asking for some help and was declined. She does not have any kind of insurance as follow, and from what I earn from my job I am not able to pay out of the pocket. Is there any advise I can get? Thank you.