I agree, it sounds like she is trying. Heroin is a really tough one especially at that age.
I've seen a lot of them just give up and give in and say forget it. Rules for any 19 year old are tough, let alone in a rehab who wants her to quit smoking on top of heroin and work on herself and everything else. If you can get her into someplace else and she
still wants to I would go for it. Heroin is such a nasty drug and a hard one to kick, but it
can be done. If she wants to and it sounds like she does.
Love and Light and Prayers to you all.