I am not sure if it ever really does change much. My DD was always a writer. She would write lists, books, endlessly. She would copy books. She has made up some of her own fascinating stories. She somehow managed to persuade 4 other girls in her classroom to group up with her and do a book club. They read and discuss their books at recess and they often spend time making their own books. I am so happy and grateful that she found some kindred spirits in her classroom. And I don't foresee her choice of play changing much in the near future. Last night she made a book of puzzles. Then she sat down with her dad and challenged him to complete them. She does this sort of stuff CONSTANTLY. It is her "play".