Hmmm...you know, KAW, maybe there is something a bit deeper here. I'll speak from my own experience. You see, when my W was in WAW-mode, she was somewhat negligent with the children...emotionally that is. As a result, she feels guilty about it, but is doing what she can to improve those Rs. She still struggles with the responsibility of having children and being a mom. She'll snap at the kids (not so much these days) and feel badly about it afterwards.
Perhaps it is somewhat similar with your W??? I do have to say that her R with your D is something your W has to contend with--whether it's guilt from the past, or difficulties with the present. It's unfortunate that she is not talking to you about it. Is she going through another bout of depression?