Seriously I’m not sure how she could ever return to the good side. Issues you may or may not have with how it was done: she triggered a near genocide of an entire race. You cannot un-do that, killing individual heroes, okay, but nearly wiping out an entire people. Let me say that one more time for emphasis – she nearly caused the extinction of an entire race. Could Hitler have come out of the bunker said I’m really sorry and all would be forgiven? No (and yes I went there I went Hitler) of course not. Now if Marvel editorial wanted to go ahead and allow the M-day to be reversed, okay possibly. However that’s like letting a dangerous but medicated schizophrenic baby-sit your kids. How could anyone ever trust someone like her again, the remainder of her existence should realistically be a drug induced catatonia. We’re not talking about a mutant with pointy claws and anger issues, nor are we talking about one who can shoots lasers from his eyes – heck we’re not even talking about one who could crush a skyscraper with the force of magnetism. We’re talking about a threat that can alter the fabric of reality, next time you want to see her in a position of trust consider that. And people say Superman is too powerful to be written about. You could make an argument for “keep your friends close and your enemies closer”, but okay you have a shield and acrobatic skills while the sun is about to go supernova – best of luck. This women is a significant force of nature that no one was able to stop before. She is a flood that cannot be contained, she is the fault line under the nitro glycerin factory – she’s like the weather everyone complains about it but nobody ever does anything. Because just like weather there isn’t anything to be done, but bring an umbrella, unless she removes umbrella’s from existence.