They did mention somewhere that the drops were increased at some point. (No clue what they were before or what they are now. Just that it is supposed to be better now.)
Before this event the only girl drop I'd ever gotten was Halloween Juliette. Trying for Winter Agate I got Sheheramazond first (I think I posted to mention this earlier in the thread, I was not expecting to see one of the non-event drops) and then after a little more trying I got Winter Agate. I got Xmas Bunny before too long after that, and then I was doing a few matches in each of the worlds at random and also ended up getting Eugenie.