My memory of this book is quite old, but I don't think it's out of the question age wise. I read this somewhere around that age/grade (not sure exactly) in HS in the late 80s; we also watched the film.

Having her home and willing to discuss would be beneficial, as well as reading it with her. I would not consider this a summer camp book.

The book is more explicitly described, but leaving the visual impact to the imagination. The movie, while excellent, was edited down and ultimately rated PG-13. It was hard to view at points, but the book is/was stronger in my memory.

Hope this helps a bit.