This is how she deals with her emotions and she is now completely covered in scars that spell out full on words. Through the book, we get to see her deal with these issues and also solve the case. Another interesting factor is her young half sister who acts as a crazy adult outside of the house. But when she is home access her mother's baby doll, which is very strange for a 13 year old. We get to see the mother's weird tendencies and how they ruin this family
So not only do I recommend watching the series like you said, but definitely try to find those postproduction videos somewhere on YouTube. And if anyone seen those, who wants to chat about that, please, please post