I believe the theme of she said yes is everyone can change. I think this because Cassie was a bad kid in middle school and some of high school. She talked about murdering people and killing herself she hung out with the wrong type of crowd. After her parents tried and tried to get her help it seemed like she would never change. She eventually did and was because of that one trip she went on with her youth group. This shows me that the any moment can change someone forever. When the author wrote about this moment when cassie changed it made me realize that somtimes it takes time for people to change and other times it can take a day, but everyone is capable of change. Another reason I believe the theme of the book is everyone can change is because how Cassie ended up like a sweet girl who did nothing but help and please others. Before she was rude, and disrespectful. In the begging of the book she said she had sold her soul to satan but in the end her soul really belonged to god. Cassie changed a lot in the book, and the book made me think more about how everybody can change.