Johnson began competing for the LSU Tigers gymnastics team in the 2020 season. She competed all-around in 9 of 11 meets. On January 24, she earned her first career perfect 10 on the balance beam at Florida, and on February 14 added a perfect 10 on the vault at the GymQuarters invitational. She also posted season-high scores of 9.95 on the uneven bars, 9.975 on the floor exercise, and 39.75 in the all-around.[10] She was named SEC Freshman of the Week for four consecutive weeks beginning in January,[11] and also earned the SEC Gymnast of the Week honor following an all-around win against Auburn on January 17.
At the conclusion of the (prematurely terminated) season, Johnson was named the SEC Freshman of the Year. She also earned first team All-America honors on vault, floor exercise, and the all-around.[12]
On January 8, Johnson earned her third career perfect 10 on floor exercise in a meet against Arkansas. On March 5, she scored another perfect 10 on the event against Missouri.[10] At the SEC Championships, Jonnson scored her third perfect 10 of the season on floor exercise, winning the SEC title on the event. She also placed second in the all-around behind Luisa Blanco of Alabama.[13] During the NCAA Championship semifinals, Johnson competed in the all-around, however LSU failed to advance to the final.[14] At the conclusion of the season, Johnson was named SEC Specialist of the Year.[8]
On February 5, Johnson scored her sixth career perfect 10 on floor exercise against Auburn. On February 18, she scored another perfect 10 on the balance beam against Alabama.[10] At the NCAA regional semifinals, she contributed scores on all four events, however LSU suffered two uncharacteristic falls on balance beam and as a result was eliminated from the postseason during the first round of regionals, failing to qualify for the national championship as a team.[15] Johnson qualified for the NCAA Championships as an individual competitor on vault. She finished sixth on the event with a score of 9.9125.[8]
During the second meet of the 2023 season, Johnson suffered an Achilles tendon rupture on floor exercise, which ruled her out for the remainder of the season.[8][16]
Johnson returned for the 2024 season for her fifth year of eligibility. On January 19, she scored a perfect 10 on floor exercise in a meet against Kentucky, one year after she tore her Achilles competing on the same event against the same team.[16] At the SEC Championships, Johnson competed in the all-around, helping LSU win the SEC conference title. She also tied for the SEC floor exercise title with Kentucky's Raena Worley and teammate KJ Johnson, all posting 9.975s.[17] During the NCAA Championships, Johnson once again competed in the all-around, helping LSU win their first national championship title in program history.[18][19]
| Season |
Date |
Event |
Meet |
| 2020 |
January 24, 2020 |
Balance beam |
LSU vs Florida |
| February 14, 2020 |
Vault |
GymQuarters Invite |
| 2021 |
January 8, 2021 |
Floor exercise |
LSU vs Arkansas |
| March 5, 2021 |
LSU vs Missouri |
| March 20, 2021 |
SEC Championships |
| 2022 |
February 5, 2022 |
LSU vs Auburn |
| February 18, 2022 |
Balance beam |
LSU vs Alabama |
| 2024 |
January 19, 2024 |
Floor exercise |
LSU vs Kentucky |