DD also picks books that are too easy and I think it has something to do with her ADHD/EF issues. She is a super fast reader and read Harry Potter in a couple hours a couple years ago (when she was about 7) but I don't see her progressing much in terms of the level of books she reads. When she does jigsaw puzzles she does not spread all the pieces out, like most people would, she pulls them out of the box one by one. I asked her why she does that and she says it causes anxiety to see too many pieces all at once. I see reading large books with small print as possibly being the same way. It's just "too much". She likes pictures, words that are not too difficult, and big print. I'm not sure how important it is to "force" them to read books that are at a more appropriate level.