M.R.
What ever you do for dicipline, you need to do it every time consistently and with love, so that she knows that you dislike the behavior, and still love her. You may have to do this more than you would like to, but eventually, it will sink in and she will get it.
It is natural for her to feel this way. If your husband came home and said, "sweetheart, I love you so, so much that I am going to bring home another wife so that I can have more of what is so great about you..." you would hate that too! She can feel the ways he feels, but she can't strike out, and be grateful that you have the chance to teach her this lesson at home, where she is safe and sound and in a loving enviornment!
M.