At Arizona, McQuillin began her career as a Third-Team All-Pac-12 performer.[12] She debuted on February 12, 2016, throwing a shutout with 6 strikeouts against the Southern Utah Thunderbirds.[13] In 2017, she was named conference Second Team and had a career best strikeout ratio (9.2).[14] McQuillin opened the season by striking out a career best 17 batters in a shutout win over the CSUN Matadors.[15]
As a junior, she set season highs in wins, strikeouts (school top-10 record), shutouts (led the NCAA) and innings pitched.[16] She was also named a First Team All-Pac-12 honoree.[17] Facing the New Mexico Lobos on February 11, 2018, McQuillin threw a no hitter and began a career highlight of 14 consecutive wins, until suffering a loss to the Washington Huskies on March 23.[18] For the streak, she tossed 93.0 innings, allowing 35 hits, 2 earned runs, 22 walks and amassing 121 strikeouts, resulting in a 0.15 ERA and 0.61 WHIP. For one of the wins on February 22, she sealed the victory with 2.1 scoreless innings and went on a personal best 30.1 shutout streak that was ended in the third inning of a win over the South Dakota Coyotes on March 8. She gave up just 7 hits, 11 walks and fanned 36 for a 0.60 WHIP.[19]
For her final year, she earned her second First Team and fourth overall conference honor and also was recognized a First Team All-American by the National Fastpitch Coaches Association.[20][21] She set season bests in ERA and WHIP. McQuillin led the Wildcats back to the Women's College World Series and opened with a victory vs. the Washington Huskies on May 30, 2019.[22] McQuillin made her last appearance by pitching four scoreless innings with 6 strikeouts in an elimination loss to the Alabama Crimson Tide on June 1.[23] She would graduate ranking top-10 in career victories (7th), strikeouts (9th) and innings (10th).[24]
National team career
McQuillin was named to the roster for Team Mexico and competed at the 2020 Summer Olympics. She made one appearance and threw 1.2 shutout innings, striking out two batters. McQuillin did not play in the bronze medal game where Mexico lost to Canada 2–3.[25][26]
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