Mehaffey enjoyed a very successful amateur career and reached a rank of No. 5 in the
World Amateur Golf Rankings and No. 2 in the European Amateur Golf Rankings. Mehaffey joined
Arizona State University in 2016 and played with the
Arizona State Sun Devils women's golf team. As a freshman in 2017, she helped ASU win the
NCAA Championship by notching match-play victories in all three wins over Florida, Stanford and Northwestern (title match). She overcame a four-stroke deficit in the final round to win the Pac-12 Championship in a playoff with
Albane Valenzuela. She took advantage of the NCAA granting an additional year of eligibility for spring-sport athletes due to COVID-19 cutting short the 2019-20 season. Mehaffey's amateur pedigree earned her spots in two
U.S. Women's Opens and three
Women's British Opens, the first the
2016 Women's British Open at
Woburn Golf and Country Club when she was 18. She also competed in the
2020 ANA Inspiration, where she made her first
major cut. In 2021, she finished in a share of ninth place in her second appearance at the
Augusta National Women's Amateur. She started in the Arizona Women's Classic on the
Symetra Tour in March, where she finished in a share of sixth place after leading the event at the half way stage. ==Professional career==