What helped me heal, protect myself and be loving but not enabling to my addict son, was to go to meetings (CoDA was my home group, Al-anon another that I attended) and learn how to set boundaries, how to take care of myself even when my son wasn't taking care of himself, and how to let go of trying to control him and his addiction/recovery.
It took a while, I came to SR around the same time, and I found I learned little things, one at a time, and eventually I could see and feel the change in "me". It felt good to reclaim my life and to learn to live it well.
I hope you will continue to find help for yourself. A healthy you will help make a healthy relationship with your daughter.
Hugs