I'm confused about the phrase "get to go to". Is it different if I use only "go to" in this sentence?
Great question. To "get to" do something means that you are enabled or given the opportunity to do something. Here she is commenting about the fact that she will not be able to go to her prom. If we did not use "get to" it would not refer to opportunity. Ex: Tom gets to go to Disneyland this summer. Ex: I didn't get to sit down all day.