My dd7 is much like that. She LOVES to recite movies and act them out. Interestingly, she is really into the "Buddies" movies as well as Bolt...she still (even at 7 likes to pretend she is a dog!).
Her silliness, while endearing and entertaining, sometimes is her coping mechanism when things get too stressful.
We read books like: Elizabeth Who Is Not a Saint, Arnie and His School Tools, Mommy May I Kiss the Fishes, and When Sophie Gets Angry...there are others and of course I don't recall the authors!
