We need to know more about your journey so far and by the way welcome to our world. Many of us have been there/done that/wear the tee-shirt. Most of us are choosing to learn to detach with love from our sick but abusive loved ones who refuse to get help and are destroying everyone in their path, like a tornado. You may want to read the post on this forum about detachment or buy the book "Codependent No More" by Melody Beatty (great book). Have you gone to any twelve step meetings to find comfort and support with others in your situation?
This is my opinion. You do not have to support, financially or otherwise, your adult child even if she is a mentally ill drug addict. She has to learn to take care of her own needs and she won't do that until she is so sick of herself that there is no alternative. In fact, the more we take care of our adult children, the younger they seem to get!! I have mental illness and have had it since very young. Among other diagnosis, I've been diagnosed with manic depression (long ago when that term was still in favor), bipolar II, mood disorder not otherwise specified, major depressive disorder, borderline personality traits, anxiety disorder, panic disorder, agoraphobic traits, etc. etc. etc. I learned to handle my own mental health issues. My parents had no interest in helping me and, although they did not have kind intentions, they actually helped me by not being there. I had no choice but to learn how to handle my own problems on my own and in my own way and today I live a very happy, fruitful and blessed life. Bipolar can be controlled, but only the person who has it can control it by going to all appointments, taking medication as prescribed and abstaining from illegal drug and/or alcohol use because those last two ingredients mess with the useful medication. It renders the doctor's prescriptions pretty worthless. Your daughter needs to decide to get help for both her drug problems and bipolar disorder...SHE has to decide...YOU can't make her do it. And, in my opinion, if my parents had stepped in to hold my hand, I would not have been as proactive about getting help for myself because I'd learn to depend on them. It is easier to let somebody else worry about you than to take care of yourself. But it isn't helpful for the sick person.
Your life is important. It should not, in my opinion, be spent taking care of an uncooperative and self-destructive adult, no matter what her problems are and no matter who she is in your world of love. You matter too and you deserve a good life full of peace and serenity. I think a good start, if you are interested, is reading "Codependent No More" and going to a Twelve Step Meeting. They will not make you talk. I just listened at first (I have a daughter who abused drugs terribly and have a son who is a functional alcoholic with other issues tacked on). You have no control over anyone except yourself. That includes your adult daughter. I'm sure you've tried talking, begging, crying, paying for her, giving her tons of perks and money, etc. and that hasn't worked.
"The definition of insanity is to do the same thing over and over again, even though it isn't working."
Maybe it is time to try something new, like detaching with love, a nd giving your own life, apart from hers, to flourish. You are not the same person as she and none of us signed up for a lifetime of taking care of our children. They do need to grow up or learn the consequences of not doing so. None of us will be around forever. Most of us have other loved ones who need and want us healthy and happy. These adult kids with drug issues tend to suck all the air out of our world so that we have no time for anything else, even ourselves. And that doesn't help us or them.
Hugs for your hurting mommy heart.