Part of being a good manager is to adapt to the situation and do what's sensible. This was an example of a good manager. Conscientiousness is always a great trait.
But we got just one sample case. We don't know how she would act in the opposite situation. It could be she is a great manager but it could also be that she was promoted because the situation asked for a tyrant and she was indeed one. When someone gets promoted in the middle of a fire the person to look after to understand the decision is the person that did the promotion. Sometimes the promoted person is promoted to do the dirty work and the person above he/she it's just exploiting their personality traits.