When You Know She's Mad

But Why?
It really helps to have this bit of information.
Some women will tell you right from the start what you did that upset them.
Some like to extend the torture by not giving you a hint.
You could ask, but you’ve tried that before and it usually didn’t work. You got that most infuriating of all answers,’ "If you don’t know, I’m not going to tell you".

Damn! You just made things worse. This is not the time to make assumptions or start mentally rolling through all of the possible indiscretions she may have found out about. What ever you do, don’t start apologizing for things she may not know about yet. No point in giving her more reasons to be mad. Start simple, first check the date.