Prior to the season, Serna began training at the SG Annecy in Annecy, France, where Didier Lucine, Claudie Lucine, and Sophie Gollaz became her new coaches.[2]
Serna started the season by winning gold on the junior level at the 2014 Master's de Patinage. Going on to compete on the 2014–15 ISU Junior Grand Prix circuit, Serna would place seventeenth at 2014 JGP Croatia. She subsequently won silver on the junior level at the [[Merano Cup|2014 Merano Cup.[3]
Selected to compete at the 2018 World Junior Championships in Sofia, Serna placed thirty-eighth in the short program and did not advance to the free skate segment of the competition.[4][3]
In January 2019, it was announced that Serna had begun training in Poitiers, where Brian Joubert became her new coach.[6] The following month, she would compete on the junior level at the 2019 Dragon Trophy, where she took the bronze medal. Serna would then close the season by finishing fourth at the 2019 French Junior Championships.[3]
Serna's first competition of the season was at the 2020 Master's de Patinage in October, where she won the event for the first time on the senior level. In February, Serna would win her first national title at the 2021 French Championships before finishing eighth at the 2021 Tallink Hotels Cup one week later.[3]
Selected to compete at the 2021 World Team Trophy, Serna placed twelfth in the ladies' singles event and Team France would finish in fifth place overall.[3]
Due to Maé-Bérénice Méité being forced to withdraw from the 2021 World Championships due to injury, there were no berths for French women to compete at the 2022 Winter Olympics in the women's singles event. As a result, Serna competed at the 2021 CS Nebelhorn Trophy, the final Olympic qualifying event, however, she failed to finish in the top five and secure an Olympic qualification.[7][8] She would place fourteenth at the event overall.[3]
Serna won gold at the 2023 French Championships for a third time. Selected to compete at the 2023 European Championships in Espoo, Finland, Serna placed twenty-sixth in the short program and did not advance to the free skate segment of the competition. Three months later, Serna was invited to compete at the 2023 World Team Trophy where she placed eighth in the women's individual event and Team France would finish fifth overall.[3]
At the 2024 French Championships, Serna took the bronze medal behind Lorine Schild and Stefania Gladki.[3] Although Serna was initially announced as the French representative for the women's singles event at the 2024 World Championships while Lorine Schild would be given the sole berth to compete at the 2024 European Championships, however, following Schild's strong fifth-place finish at the Europeans, the Fédération Française des Sports de Glace announced that Schild would compete at the World Championships instead of Serna.[12][13]
