[8] She started boxing training at 12 years of age in the Gold Coast suburb of Yatala at the Jamie Nicolson Memorial Gym, which is named after her late brother.

[9] Notable students she grew up training alongside in the same Yatala gym include future world champions Cherneka Johnson and Che Kenneally.

Nicolson defeated Michaela Walsh from Northern Ireland in the final bout in a split decision and walked away with the victory in her home city of the Gold Coast.

[11] The Queensland athlete claimed her spot on the Tokyo 2020 Australian Olympic Team at the 2020 Asia and Oceana Qualification event held in Amman, Jordan after defeating Mongolia's Bolortuul Tumurkhuyag.

[15][16][17] On October 15, 2022, Nicolson defeated Krystina Jacobs by unanimous decision to win her first pro belt, inaugural Commonwealth female featherweight championship in Brisbane, Australia.

[20][21] On September 15, 2023, Nicolson challenged Sabrina Maribel Perez for the interim WBC featherweight championship at Auditorio Municipal Fausto Gutierrez Moreno in Tijuana, Mexico.

[30][31][32][33] Nicolson made the first defense of her WBC featherweight title against Dyana Vargas at Wells Fargo Center in Philadelphia, Pennsylvania, on July 13, 2024, winning the fight by unanimous decision with all three ringside judges scoring the contest 100-90.