Well if you decide on a keyblade you can give her the Lady Luck Keyblade from the first Kingdom Hearts or something like...
This: http://deidara-fuuka.deviantart.com/art/I-wonder-148677352?q=boost%3Apopular%20Wonderland%20Keyblade&qo=8
or
maybe This: http://c8lin-the-hedgie.deviantart.com/art/Ace-of-Spades-150746310?q=boost%3Apopular%20Wonderland%20Keyblade&qo=62