- "Goodbye, My Sweetheart, Goodbye" (2004) - This is a historical fiction novel set in the Depression era. It tells the story of a single mother struggles to raise her two young children during the difficult times.
- "The Last Song" (2009) - This is a young adult novel about a girl who moves to a small beach town to live with her father after her parents' divorce. She meets a boy who helps her to overcome her grief and learn to trust again.
- "Something Like Happy" (2013) - This is a coming-of-age novel about a girl who is trying to find her place in the world. She navigates through her relationships with her friends and family, and learns about herself and what she wants out of life.
- "Hello, Goodbye, and Everything In Between" (2015) - This is a contemporary young adult novel about two teenagers who meet at a party and fall in love. They must overcome obstacles to be together, including their parents' disapproval and their own insecurities.
In addition to her novels, Smithson has also written several short stories and essays. Her work has been featured in various publications, including The New York Times, The Washington Post, and O, The Oprah Magazine.