You'd have to provide more context for this to be a discussion.
What specifically drove her nuts? Discrimination? Nepotism? Favoritism?
All three at one time or another but with a common denominator.
Some companies had a kind of ingrained (negative) culture. Others had good managers that stamped on any issues. As with many of these problems it depends on the management team.
These are separate discussions to the EDI/quota thing. I see EDI in hiring practices as just another form of discrimination. Where it is perhaps useful is in helping correct the company culture but it should also be done so it doesn’t resemble a Pol Pot mind reprogramming session.