How does the book "Beloved" answer my BIG QUESTION?

The book Beloved deals a bunch with the idea of a dead baby coming back from her grave and she haunts her mother who killed her and her younger sister. In class we talked about her sadistic characteristics and the way she forced others to do things for her, and Paul D to have sex with her. This definitely could be an argument for my culminating essay, but it is a magical realistic novel and I'm not sure that I will use it, because I cannot argue very well that she is an example of humans being evil since they do not often times return from their graves.