Freshman season Johnson entered her
freshman season as LSU's starting
shooting guard. On November 20, 2022, she recorded a season-high 27 points, 10 rebounds, six steals and five assists in a 100–45 win over
Northwestern State. As a freshman, Johnson averaged 11 points and 5.9 rebounds per game, helping her team win its first
national championship. She was named the 2022–23
Southeastern Conference (SEC) Freshman of the Year.
Sophomore season In her
sophomore season, Johnson played in 36 games and started 34 of them. Due to illness, she missed one game and played off the bench in another two in November. Johnson improved her averages in every statistical category except for rebounds, and was a key player for the Tigers throughout the season. LSU finished the SEC regular season with a 13–3 record, and Johnson was named in Second Team All-SEC. In the
SEC Tournament, Johnson led the team in scoring in both the quarterfinals and semifinals, scoring 25 points against
Auburn and then 21 points against
Ole Miss. In the finals against
South Carolina, Johnson was involved in a tussle that resulted in the ejection of six players (Johnson was not among those ejected) and the arrest of her brother. After the game, Johnson apologized to Gamecocks' coach
Dawn Staley for her role in the fight. LSU entered the
NCAA Tournament as the third seed. Johnson was the top scorer for LSU in their second-round win, 83–56, over
Middle Tennessee. In the Sweet Sixteen win, 78–69, over the second-seeded
UCLA, Johnson recorded 24 points, 12 rebounds, and 2 blocks and was once again the top scorer for the Tigers and an overall key contributor. In an Elite Eight rematch of the
2023 championship game against the first-seeded
Iowa, Johnson was again the top scorer for the team with 23 points, but LSU lost 87–94.
Junior season Johnson started all 34 games in
her junior season but missed the
2025 SEC women's basketball tournament due to shin inflammation. She returned for the
NCAA Tournament and was the top scorer with 22 points in the first-round rout of
San Diego State, 103–48. She scored a career-high 28 points, 24 of which came in the second half, in LSU's Elite Eight loss to
UCLA, 65–72. ==Professional career==