None of these above solutions work. I am living this. My mother hoards cat feces, years of cat feces, so that it is more than ankle deep throughout the house. I have called social services. They contact her and humiliate her and tell me, sorry, there's nothing that can be done.
I live in a different state & swore I would never clean up her mess again in 2003. she fell & broke her back, still saying she's fine. I came to help her with her broken back & found her in kidney failure. She would have been dead.
she spent a week in the hospital, then another week in a nursing home as a charity case because her home is uninhabitable. Finally they gave her cognitive testing, which she passed with flying colors. Basically, until your mom is proven to be mentally incompetent, you can do absolutely nothing. the social worker put it to me like this: it's like a teenager who you cannot control, you have to let it go. If she wants to self-neglect, that is her right.
It's heart wrenching. Your mom doesn't have the right to force you to be her slave forever. I finally gave my mom an ultimatum & said if she goes back to that house, we are done because she will be dead in a month.
You can try to go to court to get guardianship/conservatorship, but that's very expensive. You not only have to hire yourself an attorney, you have to hire an attorney for her. You cannot go to court for this without an attorney, at least in my state.
good luck! You are not alone, I understand your troubles. Tough love I think is about the only answer. I've made it clear to my mother that I'm tired of her choosing cat poop over her only child, only family left.