If I were you I would comment the next time she acts stupidly again. I would say..."why is it, whatever her name is, that you were perfectly fine being around Kegan, oh, let's say, before you married ___________, and now you are acting the as though the dog is a monster....what has changed that you don't feel comfortable?"........ My first thought was for you to say "Oh, just get over it" ..... "and shut the *&^^ up".......... I think she sounds like a phoney to me.