I am pharmaceutical researcher and have worked with smoking cessation products. I remember from when I working on those projects, it takes an average ciragette smoker 7 serious attempts to let go of smoking - some more some less. I think the same applies to other addictions. People may take several months/years between "serious" attempts.
We just have to keep our boundaries (as you are doing) and nudge them along to that state of "readiness" when they can make a "serious attempt".
I have to say she is better than last year....but I am not entirely sure of the reason
As we get older, we get wiser. Looks like she is moving along in the right direction at her own slow pace (as is my son).