I totally understand how she feels about the smoking. I've got 10 months clean, and am trying to quit the cigarettes....did it for a week, have broken down and smoked about 1/2 a pack over the past 3-4 days, and am quitting again. I really don't think I could have even tried it earlier in my recovery.
I also have heard good things about Chantix. The only reason I haven't tried it is cost and some side effects (arthritis, even in people who have never had a problem before). It may be worth checking into.
I do think she is really trying and agree with done - it takes a while to realize you really do have to follow the rules
I'm a LOT older than your daughter, but it was an adjustment for me to go from the drug-using, homeless street person who did what I had to to survive, to living with rules and consequences again (and not being able to numb them out).
Hope she can work things out and get back into a rehab.
Hugs and prayers!
Amy