We need more age recommandation!!!!

Had an argument with precious daughter mine this week. She had been sick and was bored and of course we do have only five shelves full of books and that´s certainly not stuff enough to find fitting reading matter and school books are tiring, so she took my old ebook reader which I thought I had de-registered from my Amazon account, alas, no such luck. So daughter mine plowed through my book list and chose one book (three exactly) she thought to be perfect reading stuff for young adults who are immensely fond of princes. I gave her an earful when I detected what exactly she had been reading, and then I did research on the Internet, to find some kind of age recommandation for these books. There is none!!! So technically daughter read an adult fairy tale about gay princes, with a hefty touch of violence, incest and child abuse. At least she has her friends to chatter about these topics, no way it´s me who will discuss the various ways men may have sex with each other! One day that girl will be the death of me!