[1][2] Breuer started training in kickboxing at the age of 15 under Said El Hamdaoui at Tiger Gym Kerpen.
[5] Breuer was scheduled to compete against Terasa Sortino at Enfusion 87 on September 7, 2019, for the vacant IPCC European -67 kg title.
[6] Sortino was replaced by Zana Setzock, Breuer won the fight by technical knockout in the third round.
[7][8] Breuer came back from a close to three-year absence from competition on June 5, 2022, when she faced Ibtissam Kassrioui for the vacant Enfusion ECE Featherweight title.
Breuer's second professional bout happened at PFL Europe 2 on July 8, 2023 against Ruby Mesu, defeating her via TKO stoppage in the second round.