My guess is she is probably feeling guilty/irritated with herself about more than just the time with the kids and is using that against you. I agree with Jon, when it comes to the kids don't second guess yourself. It's all for THEIR benefit and should not be used against them. Good luck planet. It's tough.
Me:49 H:47 S: 16 T:27 M:25 My EA: 2001 His PA: 10/2007, 6/2013 Separated, but H still in house
Find your Shambala: a place of peace and happiness.