hm.. GREAT charactor, my personal favorite. Perhaps you should check out the multiple guides addressing this subject. I don't clearly remember how to unlock her, but I know she has some important things in the krypt, for of course, a hefty sum of jade koins.

Koffin OI
you can also look at ~Crow's~ Game FAQ thread to look for her alternate costume or her bio and her Alt bio
hope this helps

lol i know:( im dumb. i asked it, then i went to get moves for raiden and found out how to get her. i looked all over the place for the chest she was in, and what key i needed...heh didnt even need a key:) i like jade, she has the coolest outfit yet;) next to li mei of cource