It's very difficult to deduce causality in that situation. She could have been fired due to not fitting in with the organization due to her valid concerns, or s

It's very difficult to deduce causality in that situation. She could have been fired due to not fitting in with the organization due to her valid concerns, or she could have brought up concerns due to bias from being fired. It is most likely somewhere in the middle, where her observations were somewhat truthful and somewhat biased.