This is much easier said than done. What if her severance was significant? What if she needed it to survive? Meta's line is she was fired for "poor performance and toxic behavior" and a non-disparagement clause often cuts both ways; now instead of saying "she worked her from <start date> to <end date> this was her job title" they can publicly disclose she was let go for serious job failures. It doesn't matter if this is true, good luck getting a new job.

If the severance is significant, it's because they are making a deal with you, not because they are being nice.

Option 1: take the severance package/non-disparagement agreement and decline the $500k book deal focused on disparaging facebook

Option 2: decline the severance and take the $500k book deal.