Tonight, even though she works tomorrow, or tomorrow evening? I'm not sure getting her mad is the best place to start!
First off, you're assuming she is going to be mad or upset!
Second off, do you think she cares if you work the next day when she reems you for something?
Third off, if she does work the next day it could very well work to your advantage! She won't have all day to sit home and stew on it and lock you out of the house!
Live your life while you are still living. Riding the trail less traveled.