Damn, SOMEONE watched Scooby Doo and the Werewolf.
Also people saying she's envy instead of greed. It can be hard to distinguish but the Fallen Angel is greed. It's not that she wants to be Hikari, she's not envious of her power to the point of wanting that.
She wants Wolf even if it means getting rid of competition, kidnapping, murdering everything else. If she were envious she'd focus more on wholly taking over Hikari's place, look, powers, personality, etc.