Why didnt Miley Cyrus partcipate in any of the actual games at the Disney channel games?

Cyrus told to the public that she wasn't able to attend the 2008 Disney Channel Games because she was in Tennessee filming The Hannah Montana Movie, but her co-star Mitchell Musso was there. There has been rumors that she didn't attend because of her Vanity Fair photoshoot that ruined her image, so Disney banned her from the games.