Why Isnt Raven On The Cheetah Girls 3? I Checked On Internet Movie Database(imdb.com)?

"In a recent interview Raven-Symone states that she isnt an official Cheetah Girl, she has a singing and acting career, and doesnt want to hurt it. It has been rumored, that if Raven isnt in The Cheetah Girls 3, viewers and sales of the Soundtrack will be lower than usual."