let your opinion be known in the workplace
and forward all the evidence to the whore's husband, and online
file a lawsuit against the company for workplace discrimination
A third party can have standing to sue for retaliation under Title VII if they were negatively impacted by an employer's discriminatory actions, even if they weren't directly discriminated against. The Supreme Court case Thompson v. North American Stainless, LP established this principle, allowing a third party to sue for retaliation
everyone in the company has rights, and a right to free speech. If they fired one and not the other, it's clear discrimination that affects all employees. Get your co-workers onboard, and complain. if the cucks in management don't fire the whore, or if they retaliate against you, then they are probably fucking her as well, and they deserve what's coming to them.