Gadirova turned senior in 2020 but did not compete due to the worldwide COVID-19 pandemic. In April 2021 she was selected to represent Great Britain at the European Championships alongside her twin sister Jennifer (later replaced by Phoebe Jakubczyk), Alice Kinsella, and Amelie Morgan. During qualifications Gadirova qualified to the all-around final despite suffering a hard fall off of the balance beam. Additionally Gadirova qualified to the vault final in first place and the floor exercise final in third place. In the all-around final Gadirova won the bronze medal behind Russians Viktoria Listunova and Angelina Melnikova. She is the second British female artistic gymnast after Ellie Downie to win an all-around medal at the European Championships. During the vault final Gadirova finished second behind Olympic and World vault medalist Giulia Steingruber. On the final day of the competition Gadirova won gold on floor exercise ahead of Melnikova and former world all-around champion Vanessa Ferrari, making her the first Briton floor exercise champion since Beth Tweddle won in 2010.