Can anybody tell me why did Raven leave the Cheetah Girls at the third movie ?

Well gallaria had to leave because she had to go to college after they came from Spain

Raven Simon had a child. That is why she left the Cheetah Girls. In the movie Raven, known as Galleria was to go to college. Her mother made her go.

will some people say that she left becuz the outfits were to taight on her but there is a websit asked her why she left the cheetah's she alisema becuz i got collage and it nedds a lot of work and studys so she desided to quit a bit until she finish's and maybe she will get back at cheetah girls 4 !!!!

according to wikipedia:

"
Raven and Adrienne Rumors
Many people believed that after Raven-Symoné alisema that she would not take part in The Cheetah Girls group and that soon after Adrienne Bailon quit her part as Alana on That's So Raven because Raven and Adrienne were feuding. Raven alisema with an interview with M magazine "Yes. It's true that we didn't get along. There were lots of catfights behind the scenes and things that people just don't see. They think that we all get along but we just don't." However, in an interview with Good siku LA Adrienne, Sabrina and Kiely ametoa maoni that "Raven was in the movie with us but the three of us are actually the imba group"[4] and when asked about the catfights they responded "We really didn't know what they were talking about because we're best friends. We choose to work together and so we even asked Raven and she alisema that she never even alisema that so, I mean I don't know." [5]. It was also announced that Raven-Symone would not be touring with The Cheetah Girls.