Are the Books of Bayern appropriate for elementary-aged kids?

Dear librarians, teachers, parents, and readers,

I received this email from a school librarian. If you've had any experience with The Goose Girl, Enna Burning, River Secrets, and/or Forest Born with elementary kids, could you leave a comment for him?

"The powers that be in my school district are not allowing your Books of Bayern series of books in our elementary school libraries, based largely on the fact the reviews in professional journals tend to view them as appropriate for grades 6 and up. I feel, however, that we are doing a disservice to those elementary school kids that are ready for your books. It would be extremely helpful if you could write a few words justifying keeping your books on the shelves in elementary school libraries."

EDIT: Thanks for your ongoing comments! The librarian told me, "Our school district serves 40,000 students, and this decision to ban your books from elementary schools will affect nearly 50 schools." As far as I know, no one who read the books complained about them. This was simply a matter of a school district believing that when a professional review says "for grades six and up" that means "inappropriate for grades five and down" and so banned them from elementary schools. I believe the "grade 6 and up" was referring to average reading ability not necessarily content. I also think the district's reaction wasn't malicious but well-intentioned ignorance. Still, I hope this gets resolved! I think advanced readers of elementary age need access to complex stories that don't have mature content.