Quoted By:
If allowing Mel to return was an option, they wouldn't have needed to fire her in the first place.
She got fired for disclosing private business information to someone who did not have a professional need to know that information. Even without the precedent of Rushia having been fired 2 years earlier for literally the exact same thing, and even if Cover was not a publicly traded company, they still would have needed to fire Mel - not firing her for breaching NDA would have told their business partners that they take a "some employees are more equal than others" approach to contract violations, and it would have left a known information leaker in a position where she could leak more information.
What she leaked, who she leaked it to, and whether or not it was an honest mistake without a hint of malice? All irrelevant.