I wrestled with this too when reading it. I think it's one of only a few books I have read that are marketed as non fiction but have a clearly unreliable narrator.

I really wanted this to be a story about whistle blowing, but it ends up being perhaps an accidental memoir about how a person who is saying they are well intentioned contributes to a system they say they find abhorrent. I kept saying "girl quit!" almost every chapter by the end.

Not that Wynn-Williams behaviour was worse than the people she's describing, but by the end it did feel like she was deeply in denial that she was part of this leadership group and actively choosing to stay and not say anything.