I'm so sorry to hear about Muffin's behavior. I also think that you need to let them work is out themselves unless you see that she is really hurting Patches or Charlie. Storm is the alpha cat in my house and he can be a big bully at times towards Sunny and Pepper. I only intervene when I have to. Sunny and Pepper have learned to back away from him and to let him eat, drink, or pick his lounging spot first. Good luck.