I personally would sit down with her and have a conversation with her that you are proud of her and look forward to having a normal mother/daughter relationship and that you look forward to walking beside her in her journey.
That is just my two cents. While my DD is not an addict, she is having some other issues and her therapist helped me see that this is the best thing I can do for her, walk beside her and LISTEN.
I would definitely set healthy boundaries for yourself, as you should with any relationship.
I hope this helps!