Hello Jen, welcome. This is an amazing site that allows families and loved ones to connect with each other, no matter who their Addict is. Mine is my 22 year old son. I can only offer a small bit of advice. Watch her actions, not her words. Support her in good decisions but be firm in your boundaries. There are tons of sticky notes at the top specifically for parents of addicts. Realize that she will struggle with sobriety (it takes time to unlearn the habits and the ways our A's lived).
I would also recommend you look into Alanon or Nar Anon meetings in your area that will also give you tools that will help you and your daughter navigate the new relationship.
I wish you the best
Teresa