I will also say that sometimes, a revelation or epiphany can have a profound, drastic, and immediate effect.
I know someone who went from being a devout blooder, to doubter, to suicide in one day, because of what someone else did.
I think it likely that Ms. Kerner has, or had, some preconceptions or ideas regarding the Empire that had to be true for many things in her life to have purpose and meaning. If those ideas became untrue, no matter how long or short it too, then the drastic change is what would be seen. I don’t speak for her; this is just my observation based on others.
As for me, there was someone I would die for who managed to turn me into a mortal enemy in the space of a few hours. These things can happen.