Grrrrrrr...
I can have tantrums too, but I do it by myself with my office door closed.
I think part of the problem with our assistant is that she can't stand one of the other women on our team. (She assists 3 of us.) So, she gets fed up with this other woman and then she's in a nasty mood for the rest of the day. I think I'm too nice or maybe it's because I'm new. She knows better than to be argumentative with the other woman, but she seems to feel really comfortable getting huffy at me.
Anyway, we're having some renovations done at work, so tomorrow she'll be moving to another floor with the woman she can't stand... so I won't have to see as much of her for the next 2 months 'til the renos are done.

Hmmm... maybe absence will make the heart grow fonder?