There are a lot of officers that are absolute tyrants to their subordinates, but they get results. So, they get great evaluations and get promoted, often ahead of their peers. They usually flame out around the 05-06 level though, because their toxicity becomes too obvious to hide or ignore.
I suspect that's what happened here.
The weird thing about this is that she is a mustang with significant prior enlisted service. She must have been fast tracked along the way.
She was harshest apparently on a female officer under her command although the video showed she was pretty nasty overall. You would think she would have some empathy for the lower ranks.