In early 2018 McClain competed at the Buckeye National Qualifier and International Gymnix, where she won silver on floor exercise behind Irina Alexeeva. In early July, she competed at the American Classic where she placed second in the all-around behind Kayla DiCello. Later that month she competed at the 2018 U.S. Classic where she only competed three events but won bronze on the uneven bars behind DiCello and Jordan Bowers. In August McClain competed at the 2018 U.S. National Gymnastics Championships. She finished in fifth place in the all-around and won gold on balance beam. As a result she was added to the national team for the first time.