Hey Rob, Frustrating and bittersweet indeed - though I would suggest that you stay guarded and not allow yourself to get too lulled in by her reduced anger. Perhaps I'm just jaded, but whenever my STBX is kind or shifts toward a kinder tone it tends to lead toward something negative. That said, I've not gotten any kind of apologies from her - and though I think it may eventually happen, I just don't know if I would be able to look past all the things that I've realized about her/me/us since she left...
How are you doing with your goals and your attention to discipline? Doing what you have to do when you have to do it, no matter how you feel about it?
I hope your X continues to explore her issues and comes to terms with how you have to work together for the sake of your D.