I totally get where you are coming from EastTN, but Vapo and Kaizen are correct. Stop focusing on how much she is letting your D down and start focusing on what you can actually control.
My STBEW is the same and only focuses on her new R with the OM. My role in this isn't to judge, even though I'm just sad for my little girls, but its to be a rock for them as D is just as hard on kids as it is on us. Focus on more things you can do with your D and be there for her when W lets her down physically and emotionally. Don't make excuses for your W, but don't answer any questions your D has in regards to this issue out of anger either. I know its hard to see your D go through this and that is why she needs you more than ever right now.
Also, I would still keep records of all this. The days she doesn't pick up D from school and what not. Like I said, grab a calendar and start writing these things down.
M: 37 W: 36 T: 16 M: 11 D2: 8,3 PA: 2015 WAW: 2016 W Filed: 2017 2/07/2017 W officially dating OM2