Does this happen every month?
I can relate to being in a foul mood from time to time, but that's no excuse to act rudely toward others. I would not trust a teacher with so little self control that they would take their moods out on their students, whatever the cause.
Aikido should be fun, peaceful. harmonious, or whatever... I could accept having my mistakes pointed out, being pushed to try harder, etc. But being personally insulted and harassed is over the line.
I can't imagine continuing to train at that dojo. It doesn't sound like you trust or respect the Sensei. You don't have to like her, but I think trust and respect are necessary. I'd start looking for a new place to train.
Best of luck!