Resilient, welcome. I'm so very sorry that you are going through this devastation with your daughter. We understand what a nightmare this is for a parent. We're in, or have been in, your shoes.
I agree that there is little you can do to help your daughter. It is a powerless, out of control, terrible situation when our adult kids go off the rails.
You might give NAMI, the National Alliance on Mental Illness a try. You can reach them online, they have chapters in most cities. They offer excellent courses for parents which may be a good place for you to start. They offer resources, support, guidance, information and help to navigate the terrain you find yourself on. While there may be little you can do for your daughter, you can begin to focus on yourself so you can learn to be able to live your own life, to accept what you cannot change and to let go. I understand how difficult that is to do, I've had to do it too, but when we cannot control, fix or change our kids we are then forced to figure out how we can live with the scenarios they bring to us.......and for me that meant learning acceptance.
For me, I needed a lot of help to do that. It did not come easily, I fought it for a long time......but at some point, I became aware of how futile my attempts to change another were. I would invite you to seek counseling, therapy, a parent group, NAMI, any place or anyone you feel safe with where you can learn a very different way to parent, a way to detach as much as you can from a circumstance you have absolutely no control over. It takes time, it usually takes professional support and an acknowledgement that there is nothing you can do. That powerlessness is hard to take in, but once we recognize that powerlessness, we can begin to learn to accept what we cannot change.
At the worst times what helped me was to release my daughter to my perception of a Higher Power......what also helps is to start putting the focus on yourself, make sure you are sleeping well, eating properly, getting exercise, getting outside to breathe the fresh air. One thing my husband and I did was to take off on minnie road trips for the day.......to the ocean, the mountains, wherever you find beauty and peacefulness. Just to get out of Dodge, perhaps once or twice a week, did wonders for my well being while my daughter was in the throes of drama and insanity.
We learn over a long period of time to put our entire focus on our difficult kids and we forget how to care for ourselves. Make sure you are caring for yourself WELL. I know these steps feel somewhat worthless right now, however, with each step, you begin to get your own life back. You have a life too, you matter, you deserve to have peace of mind and joy in your life.
You might find some useful info in the article at the bottom of my post here on detachment. I found solace in books by Pema Chodron and Eckhart Tolle which helped me to deal with uncertainty and chaos. I worked hard to find some peace in the midst of the horrors that were all around me, it became my biggest intention, to find peace.
Resilient, this is an extremely challenging place you find yourself in. I am so sorry. While your daughter is out there in her life put the focus on yourself and the rest of your family. If it feels right, seek professional assistance, keep posting and take very good care of yourself. I'm glad you're here......sending prayers for you and your family and a big hug for you....