Only LIFE get it cause if your fire you get a fire stactue
I have a storm wizard and I had gotten an Ice statue for a drop, So I do not think it is School of Focus baring. But it could, maybe, it might change the percent chance to a better percent, to get any School of Focus Statue. If you are of that School of whatever the statue is. *Shrugs* I dunno, It just makes sence to me I guess.
I've tried farming her a few different times and havn't gotten anything... But i've seen plenty of people that have it so its definitely possible to get it! :D If you keep trying you will eventually get it.
When I decieded to farm her for the statue I was on my grandmaster life so it would be easy but I never got it but one day I created a fire wizard and was doing the quest to defeat her and at the end I GOT IT! Just keep trying and you will eventually get it.
I'm not really sure about the percentage. I got mine after battling her seven times, but someone else got it on their fourth try. You just have to keep fighting her to get it. It's worth it though. The unicorn statue looks like the one in Unicorn Park and other places. :D :D