If she keeps berating her ex, then maybe she isn't over him yet. I think if I was her husband, I would wonder if she was with me on the rebound.
She should just get over it and be dignified. Maybe it hurts more because he left her for a scantily clad young slip of a girl. I know that would grate on me.
It's a bit like that Javine woman, but in reverse. She stole MC Harvey from Alisha, but she is always harping on about her. It's almost like she is trying to convince herself that her relationship with Harvey is genuine and wonderful.