Her position was due to nepotism, I believe, and so her personality problems weren't disqualifying. The other person who cleaned trays was a kind of diversity hire, an adult with the maturity of a four year old or so. So I don't think "motivated employee does good work" was in her common experience. The bakers and cooks knew to keep their heads down around her. I was playing in the U.S. Open (chess) at the time, so I welcomed some time off (and then pursued other work).