Mine does that too, reads the blurb on the back of the book, decides it is boooooooooooooooring and then goes off to play flash games on the computer (which she isn't going to enjoy much while we're on Telstra wireless cos it is so damn slow - she normally goes through a few gigs in flash games a day when she's home), leaving a stack of perfectly good books unread.
One time when she did that I had to take her computer away until she read the book. It was the first of the Deltorra quest series. Turned out the book was so good she borrowed the entire rest of the series from the library
I have a child who doesn't like to be challenged. She likes easy, safe things that don't make you think, or doing things that don't require initiative. Drives me nuts. Drives her teachers nuts too.