In August, Chiles competed at the National Championships where she placed eleventh in the all-around and second on vault behind Simone Biles. She also placed tenth on uneven bars, fourteenth on balance beam, and twenty-first on floor exercise. She was not named to the senior national team. She received media recognition for competing in a Wonder Woman inspired leotard. In October, Chiles participated in the Worlds Team Selection Camp. During the competition, she placed third on vault behind Biles and Shilese Jones, seventh in the all-around and on balance beam, and sixth on uneven bars and floor exercise. While she did not make the world team, she was added to the 2018-2019 national team.