Reto qualified for the LPGA Tour through Q-School on her first attempt in 2013 and turned professional. She tied for 13th place to earn full status for the 2014 season. She finished 77th on the 2014 official LPGA money list and was seventh in the Louise Suggs Rookie of the Year race. Reto recorded a solo third at the 2014 Yokohama Tire LPGA Classic. She had a three-shot lead in Prattville, Alabama after 36 holes and shared the lead after 54 holes.
In 2019 she was runner-up at the FireKeepers Casino Hotel Championship, two strokes behind Ssu-Chia Cheng.
She won her first LPGA Tour tournament at the Canadian Women’s Open on 28 August 2022, scoring 62-69-67-67=265 (−19), for a one-stroke win over Nelly Korda and Choi Hye-jin. Her initial round 62 was a tournament record.
This is Reto’s debut at HSBC Women’s World Championship.