Because B isn’t all bells and whistles AE sees her as someone to look down on. She can’t believe that anybody would choose anybody else over her, her ego will be her downfall, it is what is perpetuating this mess. She was an attractive woman until a few years ago, and that gave her attention, but it was predicated on youth in the early days and then being a striking woman later. She isn’t used to being overlooked or not the Alpha female in the room. But she isn’t anymore and life will be more peaceful for her if she accepts that.