I'm pretty sure that the devs said they are extending the event to the 1st April, so that dream may become true, just you wait! (or get totally screwed, either way works XD)
The drop rate is screwing me over completely... I have battled the dark lord around 200 times so far, yet haven't got her...;-;
It's even worse because I have battled people who have her, making me even more frustrated with my terrible luck.