There's some troubling advice on here OP.
Twice weekly therapy has been repeatedly described on this thread as a 'luxury'. It really isn't for OP's daughter. She has a personality disorder, psychosis, trauma and self harm going on among many other issues. She's hardly in there navel gazing about whether to sail to Bora Bora or Hawaii. This really is life or death, and it is incredibly dangerous to pull this rug out while she is doing well.
It is a miracle that she is so well. There is a high mortality rate attached to many of her conditions, and she has multiple diagnosis piled on top of each other.
For someone like OP's daughter treatment may be lifelong, that's what she needs to be well.
It is terrible that this isn't publicly funded. But my god if my child had even one of these conditions I would move heaven and earth to keep them in the treatment that gave them the quality of life OP is describing.
Absolutely it needs to be sustainable, but for people saying it's a luxury and she needs to stop being 'dependent'... my goodness. Are diabetics wrong for being 'dependant' on insulin? Some people have complex chronic mental health issues, same as a physical issue.
She might never be 'self sufficient' in the sense of not needing medical / therapeutic management of her life threatening, long term conditions. That's not a realistic goal for some people. OP and her daughter are so so so lucky to be living as they are right now. That's the goal. Staying well is the next goal.
OP, please see your GP for your own support, and possibly referrals to services that support carers of people with significant conditions.
This really is a marathon not a sprint.