Just reading your replied is exhausting.
The level of energy you are having to put in, trying to spend your own money to help someone who isn't particularly motivated to help themselves.
I really wish you could see what this looks like from the outside.
Look, I get the instinct of needing to help your mom.
I think looking at reasonable options, budgeting for them, and then offering them to her is the ONLY reasonable options.
By that, I mean, do some research, put together a list of workable options, and offer to help her if she chooses one of those reasonable options, but leave the decision up to her.
It's this awful and highly inappropriate process of you trying to push her to care about things she has never cared about, that's the part that will kill you.
She isn't a child, and she definitely isn't your child.
Unless you think this situation is at the level where there should be some kind of conservatorship, then you need to respect her autonomy, especially if you don't respect her decisions.
I mentioned the apartment option upthread, not because I think that she'll go for it, but specifically because she probably won't.
If subsidizing an apartment for her is actually the best option for her and you can comfortably afford it, and she says "no"???
Well, you really can't do more.
Also, you really SHOULDN'T do more.
Your mother is an adult who makes her own decisions.
They are terrible and dangerous decisions, but that's not up to you to change. Don't take on that weight, it's unhealthy and completely inappropriate.