In her freshman year, Davidson started all 21 games for the Cardinal and was named to the Pac-12 All Freshman team and the All-Pac-12 Second Team. In 2017, Davidson was named Pac-12 Defensive Player of the Year. She was a key part of the Stanford team that won the 2017 NCAA Division I Women's Soccer Tournament and was named the 2017 College Cup Most Outstanding Defensive Player.[4] In 2018 Davidson only appeared in 3 games for Stanford as she suffered a fractured ankle on September 9 against North Carolina.[5] This would be her final appearance for Stanford as she declared for the 2019 NWSL College Draft, forgoing her final year of college eligibility.[6]
In November 2018, the National Women's Soccer League changed the rules for the NWSL College Draft to allow for players to enter the draft before they had exhausted their college eligibility.[7] This allowed Davidson to declare for the 2019 NWSL College Draft after only playing three years at Stanford. Davidson was selected 1st overall at the draft by the Chicago Red Stars, she was the second consecutive Cardinal to be selected 1st overall after Andi Sullivan was the 1st overall pick in 2018.[8] On March 11, 2019, Davidson signed a contract with the Red Stars.[9]
Davidson suffered an ACL injury in March 2022, causing her to miss the remainder of the 2022 NWSL season.[10]
Upon becoming an unrestricted free agent, Davidson signed a three-year contract with Gotham FC on January 2, 2024, to play through 2026.[11] Davidson made her debut for Gotham on March 15, 2024, in the 2024 NWSL Challenge Cup.[12] On November 10, she scored the opening goal against Portland Thorns FC in the NWSL quarterfinals; Gotham FC would go on to win the match, 2–1.[13][14] Davidson started in the team's semi-final match, where Gotham lost on penalties to the Washington Spirit.[15][16]
In 2018 Davidson played for both the senior USWNT and the U-20 WNT. She received her first senior cap on January 21, 2018, in a friendly against Denmark. After the match, she joined the U-20 squad in Trinidad & Tobago for the 2018 CONCACAF U-20 Championship.[17] Davidson scored the tying goal in the final against Mexico, but the United States lost on penalty kicks.[18]
Davidson was not part of the final roster for the 2018 FIFA U-20 World Cup as she had continued to receive call-ups to the senior national team. On July 18 she was named to the USWNT roster for the 2018 Tournament of Nations.[19]
After recovering from injury, Davidson returned to the USWNT in January 2019 and was named to the roster for the 2019 SheBelieves Cup in February.[23]
In May 2019, Davidson was named to the final 23-player squad for the 2019 FIFA World Cup. She was the youngest player on the roster and became the 6th ever under-21 player to start at a World Cup game for the USWNT after being named to the United States' starting lineup for their second group stage match.[24][25] During her World Cup debut, Davidson assisted Julie Ertz for the second goal of a 3–0 victory over Chile.[26]
Davidson made her international return from her ACL injury in April 2023, playing in the final match before the announcement of the USWNT's 2023 FIFA Women's World Cup roster.[28] Ultimately, she was not selected to the USWNT's squad for the tournament.[29]
In February 2024, Davidson was named to the USWNT's CONCACAF W Gold Cup pre-tournament camp and roster.[30] She started in the USWNT's match against Argentina[31] and Colombia.[32]
In June 2024, Davidson was selected to the 18-player roster for the 2024 Summer Olympics in France.[33] She started the USWNT's first two matches but picked up a knee contusion in a group stage match versus Germany,[34] forcing her to miss the next two matches of the tournament.[35] Davidson then returned to the starting lineup in the USWNT's semi-final and gold medal fixtures. In both games, she was substituted off for club teammate Emily Sonnett later in the match.[36][37] The United States would go on to win gold, beating Brazil 1–0 on a goal from Mallory Swanson.[38]