[2] In September 2013, she debuted on the 2013–14 ISU Junior Grand Prix circuit, competing at 2013 JGP Slovakia and finishing eighteenth.

Going on to compete on the 2014–15 ISU Junior Grand Prix circuit, Serna would place seventeenth at 2014 JGP Croatia.

Selected to compete at the European Youth Olympic Winter Festival in January, she won the bronze medal.

[4][3] In March, she competed at the 2015 World Junior Championships in Tallinn, Estonia; she qualified for the free skate and finished twentieth overall.

She began the season by winning bronze at the 2016 Master's de Patinage before going on to finish twenty-seventh at the 2016 Golden Bear of Zagreb and tenth at the 2016 Merano Cup.

[4][3] She ended her season by finishing tenth and fourth at the 2017 Coupe du Printemps and the 2017 Egna Spring Trophy, respectively.

[3] Serna started the season by finishing ninth at the 2017 Slovenia Open before going on to win bronze at the 2017 Master's de Patinage.

Between the national events, Serna competed on the junior level at the 2019 Mentor Toruń Cup, taking the silver medal.

[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] 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.

Going on to compete at the 2022 Grand Prix de France and the 2022 CS Warsaw Cup, Serna would finish ninth and fifth, respectively.

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.

[3] In her first international competition with her new coaches, she won her first ISU Challenger Series medal, a silver, at the 2023 CS Budapest Trophy.

[14] She intended to compete at the 2024 Master's de Patinage at the beginning of the season; however, she tore a ligament in her ankle and did not participate.