I say Email her. It's her choice if she reads and responds to Emails during her break, and when. It's not intrusive like a phone call or a knock at the door could be. So if you feel the need to Email her, I say go ahead! Or, if you're not sure, but need to vent, you could always start an Email to her, kind of like a journal, and just add to it as needed. I've done that. By the time T got back from her trips, it didn't seem important anymore and I didn't feel the need to send it....but my T asked me to. She knows, usually, when she is on a break, I've got an Email started somewhere....