Székely competed at the 2018 Junior European Championships alongside Bianka Schermann, Csenge Bácskay, Hanna Szujó, and Regina Medved, and they placed ninth in the team competition.

[4] Székely made her senior international debut at the 2019 Doha World Cup where she competed on the uneven bars and balance beam, but she did not qualify for the event finals.

[9] She was then selected to compete at the 2020 European Championships alongside Csenge Bácskay, Dorina Böczögő, Zsófia Kovács, and Mirtill Makovits.

She was initially the second reserve for the all-around final, but she was put in after Larisa Iordache withdrew due to a kidney infection.

[13] At the 2022 European Championships in Munich, Székely helped Hungary qualify to the team final, where they finished seventh.