Yep, the goal is for it to be as even as it can be. Doesnt always work out that way, though.
As for the feelings you have about OM and her being back together....aside from how her moods affect your daughter, not your problem, right?
You cant force someone to see that they need to do the work. And I wouldnt be a sounding board for her right now. Not good for you or for her. She needs to figure this out...you need to let her.