I think her actions speak for themselves here, she moved out and wants no contact – that’s a pretty clear message of it’s over.
The fact she is willing to talk to you with her therapist present shows she fears doing that alone with you.
I’m glad you are looking into attending al-anon, it will help with your control issues and help you understand that YOU can’t get her clean and sober, that is not your job and never was. Yes YOU got her the addiction therapist but the rest is all up to her.
Endings are hard, she is facing a life long battle and a relationship with you or anyone right now may be too much for her.
If you love her - let her be free to do what she needs to do. Respect what she is asking of you with the no contact.
I’m sure you will get closure at the meeting with the therapist.