COlin changes externally in the way that he was weak, skinny, and crippled. Then when discovering the secret garden that all changes. Internal changes for Colin include sympathy and Empathy. For Mary, she stopped getting pampered, or getting everything done for her. She used to be treated like a baby because she didnt want to do anything. Mary changed internally in the way that she stopped this habit of being babysitted all the time. Mary doesnt necessarily have an external change though.