I understand if the book contains sex or violence, but to do more than advise of comprehension level needed is ridiculous-- especially for a librarian!
The later HP books do contain violence and horror. While 1-3rd books are written for the 8-12 range, the later books are teen in content.
That said that librarian shouldn't be restricting and making that decision. When my son was in elementary the library had this rule that K-2nd grade kids had their section and were steered towards selecting books from that part of the library. But they were supposed to take out one book from their AR reading level and so those who had higher levels were allowed in the upper stacks. One of my volunteer jobs in K was to take the 'advanced' readers and help them select books in the library. I got questioned the first time by the librarian but she never told the kids they couldn't check out any books.
