I organise my better readers in much the same way, with the better ones choosing from the library so I really hope your daughter's not in my class! I have a parent helper who hears the children read their reading books while I choose books for their guided reading sessions. I would be devastated to find out that she was reading books with that sort of content, and also disappointed that those books were in our school library. I rely on parents to fill me in on content - I love reading and could recommend a few good books but cannot be expected to know the content of every book in the library. I would hope that your daughter or you as the parent would come and speak to me about it so something could be done. I also allow my better readers to bring in books from home but am quick to remind parents that we have plenty of books in school, before they complain that I'm asking them to pay for their own books!