TT, was it the first time she'd seen the book, or was she familiar with it? I just ask because when DD was learning to read, she'd muddle through a complex book over & over, figure out all of the words, etc., before she could read it fluently. Then if you heard her read it, she sounded very fluent indeed, even though it had taken a lot of work to get there. I wonder if your DD might be doing the same thing (but in her head) and might not want to read aloud until she's got a book all figured out.