Stark was a freshman at Oklahoma State University in 2019–20, where she won the Hurricane Invitational in just her second career start.[6] She won the 2020 Arnold Palmer Cup at Bay Hill Club and Lodge, Bay Hill, Florida with the International team. In her sophomore year Stark joined Pernilla Lindberg (2008) as Big 12 Conference Player of the Year, and was the Big 12's lone WGCA First Team All-American. She won two individual titles and ended the season ranked No. 4 by GolfStat with a 49–2 record in head-to-head competition against top-100 players in the country. She recorded a stroke average of 70.48, which destroyed the previous school record (71.14) set by Caroline Hedwall in 2010.[7]
In early September, Stark claimed her first LET title at the Creekhouse Ladies Open, finishing four shots ahead of compatriot Linn Grant, in the process earning membership of the LET.[13] Less than a month later, she won her second LET title at the Estrella Damm Ladies Open.[2]
In August, she won the ISPS Handa World Invitational in Northern Ireland with a commanding five stroke margin. The event, co-sanctioned between the LPGA and LET, was played concurrently with a tournament on the European Tour on the same course. The victory earned her membership of the LPGA Tour.[16] Stark made her LPGA debut as a member at the Portland Classic where she finished top-10, three strokes behind winner Andrea Lee.[17]
Stark started 2023 with a runner-up finish at the LPGA Tour's Hilton Grand Vacations Tournament of Champions in January, and won her sixth LET title four shots ahead of Linn Grant at the Lalla Meryem Cup in February.[18] In September, she represented Europe in the Solheim Cup for the first time in her career. She went 2–1–1 in the event, including a Sunday singles win against the reigning U.S. Open champion, Allisen Corpuz to help Team Europe stage a comeback from behind to retain the cup.[19]