My experience is not with a daughter, but with a recovering husband (now ex).
He is 18 months clean, and I think he'll manage to stay that way. But from what I've seen, it takes a while to build a normal adult personality.
To avoid disappointment (as to how our loved one is progressing), I think we need to stay very detached (albeit with love) and have low expectations, in the sense that IT TAKES A LONG TIME.
That's just what I've observed.
Here's to patience!