This is a YA book and, whilst the subject matter is quite sensitive, the author has handled it thoughtfully and appropriately for that age range. As a parent I do not censor books; as a teacher I obviously have to be a little more circumspect - this text is one that I have in my personal tutor library for a Y9 group. I'd say it is ok for a 13 year old - it is certainly handled a lot more sensitively than I've seen the topic handled online, where it is easily accessed.
I think a book about self-harm, being the main issue you feel about the book. Would be a cathartic sense of relief for her that she's not alone in her thoughts and the book would give her a better sense of empathy with the story. Kind of a "I'm not alone" kinda vibe. If anything that's the general gist of all forms of literature and experiencing a story.
doowgad1 t1_jdlyp2b wrote
If a 13 year old is old enough to know about slavery and genocide, they are old enough to handle psychological problems.