me being selfish and bitchy

I'm so mad right now. My GF went to work at 4 this morning and she was supposed to be off at 1. She called me at 9 and said that the girl who was supposed to close the store tonight called in sick and the boss is out of town and the only other "shift" is already there working. What did that mean? My GF got off at 10, came home and got something to eat, took a nap, and then got ready and went back to work at 2 and won't be home now until 9pm. This seriously sucks. We've barely seen each other this week and she hasn't been able to take any vacation time since we moved and since school ended because they were short on staff. She's been training people for weeks now and she still gets shit on. She said all the new people have already requested a bunch of days off so there's no way she can take even a week off. They can all fuck off.