She really can't have a role in DR:AE...
She's already dead by it.
And I mean if by some necromancer chance, they start bringing people back to life, I have someone who's the top of my list that needs to be revived. >:[
She can via the Ultimate Impostor! Or maybe Naegi's sister is the ultimate impostor after all! By the way, it was never explained in the game why the Ultimate Impostor decided to impersonate Byakuya, right? Wonder what's the reason..