I have a cousin who cannot live alone due to mental health issues. His parents put him in a residential program years ago, and of course he complained about it. A few years ago, the residence and he got sick of each other (new owners of the residence was part of the problem) but he qualified for housing and supervision under the state department of mental health. He complains about that as well, and his brother now supervises his care/finances (parents died in the last few years) but they don't let him live with them. The DMH manages his meds, all his meals, and his money (he gets an allowance through social security and disability) and the brother keeps an eye on that. He's too disruptive to have in their home. He complains about where he is and won't really participate in things, but they get him to therapy or he takes mass transit. If he doesn't cooperate at a minimal level (doing chores, etc.), they have the right to move him out and give his room to someone else on the waiting list. The brother advised the staff to take him on a tour of the rest home he'd be sent to - let him see the options and so on. That's enough to get him to calm down. Psych adjusted his meds and he's dong a little better, but he will always live in a structured situation.
Contact your daughter's psychiatrist and find out what services area available from the state, what you have to do to get her recognized as disabled, and set up a trust or whatever is needed to manage her money with you and perhaps a bank officer as co-trustee if there is not another family member who can be 2nd (after you). I'm not sure of the legalities for an adult, but that's what we did for our kids.
I would suggest you start talking to senior residences about places you might like to live - start with independent living but perhaps one that has a campus with short-term nursing care (let's say you break a leg and need help for 4 weeks...), and ultimately the option for memory care units should you need them. My mother did this - she kept her car for years, but ultimately gave it up in her 80s and used the van service. She had activities, a meal option but a full kitchen as well, an in-house bank and exercise/fitness area, cultural activities and more. Your house equity will cover the downpayment. Do what you need to so that all of your finances are in order. Do not discuss any of this with her until you make your decisions. Start talking to a realtor about what needs to be done to market and show the house - and whether than can be done with your daughter on the premises. Have the realtor discussions off-site.
You cannot fix your daughter. That's okay. You have to provide for her and you cannot be ruled by her "I'll be dead" remarks. Maybe she'll do better with a third party, maybe she won't. But the current situation is unmanageable. And the definition of insanity is doing the same thing over and over while expecting a different result.
Good luck. I know this is painful but sometimes we have to realize we help our children most by not helping them continue as they are.