Amann, welcome. I'm sorry for your struggles with your daughter. I too have a 43 year old daughter who has taken me around the enabling block a great many times. It is so much more painful when there are grandkids involved. I know. I went to court and fought my daughter for my granddaughter and then raised her.......
At this point, there is not much you can do, that powerlessness is very difficult to deal with. My best advice for you is to get support for you. You've been at this a long, long time and you're likely just exhausted from all of it. Now would be the time for you to begin putting the focus on yourself and taking it off your daughter. It's time for you to take back your life and find the peace of mind and joy that you deserve.
If your daughter has any mental illness, try contacting NAMI, the National Alliance on Mental Illness, you can reach them online, they have chapters in many cities and they offer wonderful courses for us parents to learn to cope with our adult kids and their issues. They offer guidance, resources, support, information and all around help. If that feels right, give them a call. If you aren't in some kind of counseling, I'd recommend you begin, this path we are all on is extremely challenging and can cost us our well being, our financial security and all of our resources, physical, emotional, mental & financial. Develop what we refer to as our tool box, which are all the resources we utilize to help ourselves......as simple as getting enough sleep, exercising, eating right, getting support, laughing, playing, having fun and enjoying life.
The truth is that our kids rarely change on their own, so it becomes about US doing the changing. Often that means to stop enabling, stop the flow of money to them, stop answering their calls, stop allowing them to disrespect us, stop the manipulation and to create strong, impenetrable boundaries. To that end, you might read, Codependent no more by Melodie Beattie, it's helpful.
You might want to read the article on detachment at the bottom of my post here, its a helpful article which offers quite a bit of information.
Keep posting, it helps. I'm glad you're here, there are many wise warrior parents here to offer you a safe place to talk about and get support with your adult difficult child.