Delacour qualified for her second U.S. Women's Open by shooting 9-under-par 135 to earn medalist honors at Duxbury Yacht Club in Massachusetts. Both of her professional victories have come on the Symetra Tour (now Epson Tour), the 2019 Four Winds Invitational and 2019 Prasco Charity Championship. The latter was by seven strokes over future major champion Patty Tavatanakit and helped her win that circuit's player of the year for 2019. Prior to turning professional, Delacour won the 2009 Girls Amateur Championship, which was then conducted by the Ladies Golf Union (now by The R&A) and the 2011 French International Ladies Amateur Championship at the age of 17. She represented France in the 2012 Women's World Amateur Team Championship and reached the semifinals of that year's British Ladies Amateur. Delacour and Celine Boutier were France's representatives in the COVID-delayed Tokyo Olympics (2021). She also finished third in the 2020 Australian Women's Open.