Courtenay made her professional debut on 23 March 2019, scoring a four-round points decision (PTS) victory over Cristina Busuioc at the Copper Box Arena in London.
[6] The fight was streamed live on Sky Sports' Facebook page as part of the preliminary undercard for Dave Allen vs. Lucas Browne at The O2 Arena, London.
[7][8] In June, she stopped Valerija Sepetovska by technical knockout (TKO) at 1 minute 16 seconds in the second-round of a scheduled six-round bout held at the York Hall.
[12] She bounced back from defeat with a TKO victory against Dorota Norek in December,[13] before facing Ebanie Bridges for the vacant WBA female bantamweight title.
[18] After almost two years of inactivity, Courtenay made her ring return on 19 October 2024 at the Copper Box Arena in London, England, losing a six-round contest on points 56–58 to Catherine Tacone Ramos.