She needs atonement because she's going to be a punching bag for eternity, not just on message boards but for characters in-universe. Mutants are going to be calling her a 'murderer', punching her or making insults. Characters are going to keep bringing it up like Cyclops killing Professor X now. I really do think TPTB at Marvel think the character is more interesting as a pariah then just a hero, and have no plans to really redeem her.