They hired her to make the firm better, but the firm’s leadership wanted to believe they were already great.
Some management demonize people, accusing them of being the problem instead of solving the problem that is being raised.
It’s not comfortable to see your shortcomings; this discomfort causes leaders to deflect and defend, and when leaders do this, they limit whether their organization advances.
article here: https://hbr.org/2020/01/dont-demonize-employees-who-raise-problems