ok, so what if there was a sucker punch 2? well, this is what i'd do with it...
Following her lobotomy, Baby Doll keeps having strange action-sequence dreams. After a while, she reaches the Wise Man who tells her that in the afterlife, Blondie has been condemned to 5 years of being a prisoner for betraying the others, Amber faded quietly into oblivion, never to be heard from or seen again, and Rocket is trying to find a way to communicate with Sweet Pea. Baby Doll is shocked to realise she knows who they all are and what he's talking about.
As Baby Doll wakes up, Blue tries to seduce her, telling her she wants it, but she refuses, punches him, and tells him that she remembers everything before leaving. Blue confronts the guy who did the lobotomy, and he confirms that he did complete it. Blue, angered, sends men out to look for Baby Doll who has managed to slip out of the centre as, technically, she no longer exists.
After a while, Baby Doll his her head and whilst unconscious, is able to contact Sweet Pea. She tells her that Rocket is looking for her and she needs to be prepared.