Crime fell during her tenure. Maybe that was a problem; maybe she fell afoul of diverse (i.e. black) elements of Oakland’s population.
https://sanfrancisco.cbslocal.com/2020/02/21/sudden-firing-oakland-police-chief-anne-kirkpatrick-questions-confusion/
http://www.city-data.com/city/Oakland-California.html
Was it a real fall, or a non-enforcement fall?
Sometimes hard to tell.