Gumidabear

Well, I really need help, I downloaded Celestia along with my 2 other friends, my other friend tried to download but whenever she opens it up, the login with the pass and stuff won't show up, the server will open but when she clicks connect, nothing comes up after that. and I don't know what to do, anyone know what's going on? She keeps trying to redownload it and everything, just won't work :( please help!