I think you are being punitive. She has called you AND emailed you, and you don't bother to respond? If you had the slightest idea of how difficult nursing school is, you probably wouldn't blame her for needing some space. If you love her, get off your ass and call her before she decides you are too much trouble. Ask her why she is contacting you, and if she just wants to check in, tell her not to call you again unless she wants to reconcile. Otherwise, you are single and are allowed to date. You don't have to let her play games with you, but you shouldn't be playing with her, either.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?