Hernandez made her senior debut in 2016 at the City of Jesolo Trophy in Jesolo, Italy, where the U.S. team won the gold medal. Hernandez won the bronze medal in the all-around with a score of 58.550, behind two U.S. teammates, fellow first-year senior Ragan Smith and Gabby Douglas, the 2012 Olympic all-around champion. She also earned a silver medal on vault and a gold medal on balance beam, ahead of Smith and 2012 Olympian Aly Raisman.