Bravo on your continued sobriety. ((((((((((((((((artman))))))))))))))))). I'll have to tell my son about you. He celebrated his 4 month last week.
Ask and see if she'll go with you to a few alanon meetings. Tell her she won't have to talk or share if she doesn't want to. Just something like, "hey, wanna go with me? I'd like some company". Just a casual sort of thing.
Also consider sitting down with her and ask her what's on her mind. This might backfire, but then you'll get some answers. Counselling might be a good idea too.
Blessings