Dixie is a vital member of Cash's group, the Singing Strays, who gets in an argument with Cash towards the very beginning of the movie. She causes chaos after feeling she had been replaced by Copper, and finds information from Tod that proves useful to her cause.
After convincing Tod to help her, all destruction breaks lose at the fair, causing Copper to be fired from the gang. This causes turmoil in the gang, and they all end up breaking their seperate ways feeling sorry for Copper.
In the end, though, Dixie and the rest of the gang are re-united and all together again.