As an amateur, she made six starts on the LPGA Tour, including the 2018 U.S. Women's Open, where she made her first cut and finished T27. She won the Century 21 Ladies Golf Tournament on the 2018 LPGA of Japan Tour.[3]
Professional career
Gillman turned professional in late 2018 after she finished T13 at the inaugural LPGA Q-Series to earn membership for the 2019 LPGA Tour. She made 22 cuts in 26 starts her rookie season, with a career-best T3 finish at the Buick LPGA Shanghai. She finished 43rd on the money list and second in the Rookie of the Year standings, behind Lee Jeong-eun who won the 2019 U.S. Women's Open. Gillman made the cut in three majors, including a T6 finish at the 2019 ANA Inspiration.