McGlynn registered for the
2020 NWSL College Draft in January 2020.
Sky Blue FC selected her with the 20th overall pick. McGlynn made her NWSL debut in a 1–1 draw against
Kansas City NWSL on July 3, 2021. The match was her only appearance of the season. Piteå signed McGlynn to replace departing goalkeeper
Guro Pettersen. McGlynn appeared in all 26 of the team's matches in the
2022 Damallsvenskan, conceding 26 goals and being credited with 9
clean sheets. Piteå finished the season in 7th place. She announced in October that she would leave the team and return to the United States to get married . Before leaving, McGlynn was awarded the 2022
Norrstjärnan award as the top women's footballer in
Norrbotten County.
NJ/NY Gotham FC (2023) McGlynn signed a two-year contract with NJ/NY Gotham FC on January 6, 2023. In August, she became the team's starting keeper after
Abby Smith's season-ending injury. In the
2023 NWSL Championship, McGlynn was sent off in the 90+7th minute for handling the ball outside the penalty box. Outfield player
Nealy Martin replaced her in net as Gotham held on to claim the championship 2–1 against
OL Reign.
Utah Royals (2024–) McGlynn was traded to
Utah Royals in December 2023. She had a breakout 2024 season starting 24 regular-season games and making 84 saves (fourth in the league), earning a nomination for
NWSL Goalkeeper of the Year. Utah signed McGlynn to a five-year contract extension after the season, keeping with the team until 2029, the longest active contract in the NWSL. McGlynn registered her first career assist on March 15, 2025, playing a long ball to newly signed
Bianca St-Georges who finished against
Bay FC in the season opener, which finished 1–1. ==International career==