I am so sorry you had a rough day with D6. That is so hard. You will find many parents on here (moms and dads) that have to be the rock, put their foot down, not let them stay up til 11pm, eat candy, get everything they want. Its not fun, but its you, being Mom, doing what's best for her.
You are doing your best, hanging in there. Try not to think of the fact that H isn't 'interested' in her life right now, just think of how much you aren't missing, how involved you get to be. You are the lucky one.
May I ask something? Is he avoiding D because he has to interact with you? Are they positive interactions? I know my H would physically retract when he had to deal with me in the beginning because he was bracing himself for rants. Now I see him relax because I am relaxed.
I hope you have a better Sunday. Let us know how your first day went tomorrow!