I'm fascinated by Marie as this manipulative, self-centered character, and it's so interesting how there's this contrast of her being self-aware of her actions, but not of her feelings.

At the beginning of this chapter, Marie thinks about Sadie being punished for Agatha's death and the fact that "her friend was not able to manipulate her parents as well as she was." She knows the power she has towards other people, through her words, actions, but also beauty and status, and she actively uses that to get what she wants as we've seen multiple times already throughout the book.

However, she is oblivious to this superiority complex she has and how everything must always revolve around her. There's a line in ch 6, after Agatha's death, that I found showed this really well - "Marie was shaking. She had been so concerned with the fate of the maid, she hadn't had a chance to really think about the implications of these events were for her.". She couldn't care less about the fate of the maid and she never stopped thinking about how this would affect her, even this "worry" she had towards the maid was not really about whether she lived or died, but rather if she would forgive her for what Marie knew she had just done. She knows the actions she takes but convinces herself of her innocence.