Did this character experience any growth or changes during the story (explain)?

Viola is quickly taken into Orsino's confidence, and he tells her all the secrets of his heart; she is entrusted with wooing Olivia, though Olivia herself falls for Viola as Cesario. Viola herself is in love with Orsino, though she cannot admit this; she does succeed in gaining Orsino's affections, however, and gets him to be a more honest, less self-centered person. I don't think that Viola herself needs to change. She is pretty much without many faults. He role is primarily to affect other characters like Orsino.