Me thinks she has a screw or two loose. Perhaps the apple doesn't fall far from the tree, though one could hope. Yikes! I don't envy you that ride home.
kat
Now, the good thing is that when she has these tantrums she tends to burn herself out and by the time we head home she's a happy camper again. But,I don't think the boss will put up with it much more nor should she.