No matter what I do I seem to be having a hard time not poking the bull!
Is your girlfriend the bull in this scenario?
Yes and I can't seem to do anything right when she's in a bad mood.
I agree! When I notice someone in a bad mood, I tend to tip toe around them as to not make them mad. I do not want that wrath!
I thought I could talk to her about it but it seems like today is not the day!
Yeah, you have come to the correct solution in that now is not the time to deal with the issue. Let her mood improve and then you two can talk rationally.