What happens to Susan in the last battle and does Caspian return to?

I have heard that Susan does not return to Narnia in the last battle. Does she return after she heard about Lucy,Edmund and Peter about the fact they died in a railway accident? I have not read the book yet. I like spoilers. So does Susan return to Narnia after she hear the news about Lucy,Edmund and,Peter fate? Does Caspian return to?