OK, OP. break it down.
What did YOU do to make her pissed off? Can it be something that is rectifiable?
Take ownership of your part, and then let her sort out the rest. IMHO, she saying she's stressed from work is a pretext......it's clouding her emotions, but then she probably just needs time to mull over it. And it's not a gender thing, human beings are diffrent and we all manage emotions differently....