I think that it is a good idea to move on. I wouldn't take it personally since she is obviously having problems of her own and behaving in accordance with what is going on in her life instead of paying attention to you and her. I think you are right, she sounds rude and inconsiderate to not even sit and talk with you so you can better understand what's going on. But I'd just say, "to heck with it" and find another girl who appears to take an interest in you right now when you want it :-)