Hi Mama, I'm so glad you found us. I think you're going to really like it here.
Addiction is often referred to as a family disease. We let their problem become our problem. It's insidious that way. I can tell by your post that you already recognize this.
Try getting yourself to an Alanon meeting. The support is fantastic. I read your other post, and know you enjoy meditation. That's great. Alanon will also help you turn your focus away from your daughter and onto yourself.
Your post is riddled with examples where you're beating yourself up over not doing the right thing for her. You're doing the right thing by loving her. You're a good mom. She knows she can come to you when she's ready. In the meantime take care of yourself. You didn't Cause your daughters addiction. You can't Control it, and you can't Cure it. These are often referred to as the Three C's. Maybe repeat them like a mantra.
Again, I'm glad you found us.