I have finally found an author my 3rd grader will read!  It came after many searches.  We went through vampires, fairies, witches, all kinds of fantasy, even graphic novels before we hit this one.  It is one that has been around a few years. Even one she said no to several times.  Then I checked one out from the library with the only requirement being at least 100 pages.   Since she has become a moody little girl, I thought the title was appropriate!
Judy Moody Was in a Mood Not a Good Mood a Bad Mood by Megan McDonald.  She had even watched the movie and didn't think she would like the books.  But low and behold, we hit pay dirt! She can not put the down.  Even finished one in a day.  Keep them coming Megan McDonald.  I finally have her reading like I want her, a book a day.