In my opinion, Curley's wife's dream of becoming a movie star dies when she marries Curley. I think that you can see this symbolized in the fact that she is never even given a name in this book. That shows, to me, that she has essentially had who she is taken away by marrying Curley.
If you think about it, now that she's married to Curley, what chance has she got of ever becoming anything? In those days, women didn't have a lot of opportunities once they married and Curley is even less likely than most men to ever let his wife get any independence. As jealous as he is, he would never let his wife become anything.