The other thing I found kind of weird is that MM is able to remember almost every phone call she had with JY the night of and the morning/afternoon after the murder. Yet she doesn't really remember what they talked about other than his sales call and him mentioning it and seeming disappointed and irritated that it was a wasted visit and "it didn't go the way he wanted."
That may have more to do with the fact that she's been presented with this evidence about her part in the call activity that evening how many times now? I'm not trying to defend her. I just don't think he would of told her about it, at least not on Nov. 2.