Eh, odds are it won’t hurt her even in puberty-influenced disequilibrium. You would not believe the crap I read from 11 or so onwards, some of it given to me by teachers even! And I don’t think any of it scarred me permanently. Even the 2 or 3 absolutely horrid books I read despite (or perhaps because of) rightful warning-off by my mother. And I was book obsessive as well, to the point that some English teachers forbade me doing book reports on more then one book by any given author.