I heard that she may be the first billionaire whistleblower, when given a percentage of the fine assigned to Facebook.
Under what whistleblower statute? There are various statutes that provide different percentages, but there are strict rules for qualification. I haven't seen any indication that she is a qualifying whistleblower under any statute (though admittedly I am not deeply following these revelations).
The theory of the case is that FB is misleading investors by not disclosing this material information.
https://www.sec.gov/spotlight/dodd-frank/whistleblower.shtml