Seattle Reign, 2017 On 12 January 2017, Johnson was selected by
Seattle Reign FC as the 16th overall selection in the
2017 NWSL College Draft. She made her debut for the club in a match against the
Houston Dash on 22 April 2017 and scored her first goal helping the Reign win 5–1. Mostly coming off the bench as a substitute she finished the season with four goals and two assists.
Sky Blue, 2018 In January 2018, Johnson was traded to
Sky Blue FC. She was named Player of the Week for Week 21 of the 2018 NWSL season after scoring 2 goals in Sky Blue's 2–2 draw against the Utah Royals.
Chicago Red Stars, 2019–2021 In January 2019, the
Chicago Red Stars announced they had acquired Johnson from Sky Blue FC in exchange for the sixth overall pick and highest second-round pick in the
2020 NWSL College Draft. Johnson had her first appearance for the Red Stars as a substitute for
Sam Kerr in the 46th minute of a 2–1 loss to the Portland Thorns in the 2019 Thorns Spring Invitational preseason tournament
San Diego Wave FC, 2022 In December 2021,
San Diego Wave FC announced it has acquired the rights to Mexican international Johnson, fellow Southern California native
Makenzy Doniak and
Kelsey Turnbow in a trade with the Chicago Red Stars. In exchange, the Red Stars received roster protection in the
2022 NWSL Expansion Draft plus allocation money. In November 2022 the team announced her contract would not be renewed.
Angel City FC, 2023–2024 In January 2023, Johnson was signed by
Angel City FC on a two-year contract. Her first appearance was in Angel City's season opener which was also her 100th NWSL game. Johnson came off the bench to score her first goal for Angel City on 2 April 2023, a last minute match-winner against
Orlando Pride in a 1–2 victory. Johnson made 18 regular season appearances and scored 3 goals during her first season with Angel City. At the conclusion of the
2024 season, Johnson became a free agent and on 10 December 2024, Angel City announced they would not be signing a new contract with Johnson. A few weeks later on 20 December 2024, Johnson announced her retirement from professional soccer after eight seasons in the NWSL. ==International career==