Don't know where to turn??

Mother in law is 95. Lived in a single wide MH behind us for over 10 years. I saw dementia coming on a few years ago, but couldn't convince my husband. Dec 6, 2019 she was hysterical. Seeing people in her house...trying to steal her money...dogs under the house barking, etc. I have butted heads with her for more than 40 years, but I agreed she could no longer live by herself. We moved her into a spare bedroom. Husband works seasonal, so he cared for her Dec-Mar. When COVID19 hit, I had to work at home. I still work full time and when this crazy time is over, I will have to go back to my office. (husband is working his seasonal job now)
Many problems: she is mostly spanish speaking (I don't speak it well), deaf and refuses to wear her hearing aids, still sees and hears things (undiagnosed dementia), wears diapers and rags (we bought depends and she wants to "save them" for when she goes out), walks with a walker (but we have to watch her 100% of her waking time...tries to walk with it behind her??), wanders when left alone, dozes off during the day..in a chair. Refuses to lay in bed. "Loses" all kinds of things and finds them in strange places. Sundowners....goes to bed at 8p-930p, then spends the next 2 hours tearing up a 10 x 12 bedroom. We have a monitor in her room. We can't go to bed until she is asleep. She had many falls at her house, and a couple since living with us. Doesn't remember when you tell her things. Had a 6' rattler in our carport. Had to put her back on the porch 3 times before we could kill it!!! She talks about people, uses strange names, then gets frustrated when her son doesn't know what she is talking about. When she has bad moments, she only speaks rapid spanish. Not the broken english I can keep up with.
She ALSO has a small dog that USED to be potty trained. Don't want to even talk about my carpets. This animal requires more care than I bargained for. I know mother in law would die without her.
We are 60 and 63. My husband is the only living child. She has outlived 2 husbands and 2 sons. Her physical and mental health are deteriorating....My children are self absorbed and no help. We can't afford to pay someone to watch her. Barely keeping above water ourselves. She is on Medicare and Medicaid.
We have taken in family members for most of our married life. Ex son in law and 2 grandchildren lived with us most of 2019. Moved out before Thanksgiving.....then 2 weeks later we have mother in law. We no longer have a life and not a clue where to turn to get help..........
Having written all this, NOW I really feel overwhelmed!