While I feel sorry for the maid for getting raped and then manipulated... well I can't really say anything because she is just as much as a victim as being a rude. It's understandable really. Many bullies are also like that. Sure there are the real psychopathic bullies, but there are also the bullies that become bullies from mental trauma and abuse.
The maid is emotional weak and easy to manipulate, but she was raped by the baron or whoever (I assume its rape, because that's what the wording implied), which leads to emotional distress. If we know anything about psychology is that people are the easiest to manipulate when they are at their worst. That's how cults work.
Is she beyond redemption? Of course not. But trying to healing the body has always been easier than healing the mind. If they just toss her off as a typical cannon fodder, that would be pointlessly disappointing because that's not how people should be treated (even if it is how they are treated), even if its a fantasy story. You need to help them heal their mental trauma first. And then if they recover but still act like a bitch, then try a little more before giving up.
I mean, showing us her back story, means there's probably going to be more to it than just being a cannon fodder, or maybe the author subscribes to G. R.R. Martin's style of killing everyone given a backstory.