Yes, too much drama!
I'm sorry your sister has a bad boss too. If he knows she must keep her job it is only worse. We would say he has her 'over a barrel' meaning helpless to do anything about it.
My husband also has worked for bad bosses. At one company they even told him they wanted him to quit because they wanted to hire someone who would work for less money and less vacation time. If they fired him they would have to pay for his unemployment. If he quit they didn't have to pay. (He did quit but only after he found a better job.)
So bad bosses everywhere and it doesn't matter if you are doing a good job for them. Lots of movie material! :-D