On March 8, she earned her first career perfect 10 on the floor exercise against Oregon State, earning SEC Specialist of the Week honors. At the SEC Championships, she posted scores of 9.9 on the vault and the floor exercise to help the Tigers to another team title. In the team finals of the 2019 NCAA Gymnastics Championship, Kelley contributed scores of 9.8875 on the vault and 9.95 on the floor exercise to help earn another second-place team finish for the Tigers. She earned second team All-America honors on the floor exercise. Having missed an entire season due to injury, Kelley was eligible to take a redshirt year but instead opted to retire and end her career after her senior season. McKenna lives in Cedar Park, Texas, United States.