A professional boxer since 2013, Brodnicka became European female lightweight champion on 19 December 2015, beating Belgium's Elfi Philips for the vacant belt by unanimous decision.

[3] On 13 May 2017, she won the interim WBO female junior-lightweight World title thanks to a unanimous decision success over Irma Adler from Bosnia.

[6] Brodnicka made her mixed martial arts (MMA) debut on 28 August 2021 losing to YouTube personality Aniela "Lil Masti" Bogusz by stoppage due to punches in round three of the contest staged by High League at the Ergo Arena in Gdańsk, Poland.

[7] At the same venue on 4 June 2022, Brodnicka got her first MMA win overcoming Kamila Wybrańczyk by unanimous decision.

[8] She switched promotions to FAME for her next fight on 20 May 2023, when she secured a unanimous decision victory over Marta Linkiewicz at the Atlas Arena in Łódź, Poland.