In her professional MMA debut, Neilan faced Camila Rivarola at Bellator 227 on September 27, 2019. She won the fight by unanimous decision.[1]
Neilan faced Chiara Penco at Bellator 240 on 22 February 2020. She also won the fight by unanimous decision.[2][3]
Neilan faced Claire Lopez at Bellator Milan 2 on 26 September 2020. She won the fight via a rear-naked choke submission in the second round.[4]
Neilan faced Audrey Kerouche at Bellator 270 on 5 November 2021.[5] She won the bout via third round technical knockout.[6]
McCormack faced Stéphanie Page on 25 February 2022 at Bellator 275.[7] She lost the bout via first round technical knockout, making it her first loss in her professional career.[8]
Invicta FC
McCormack faced Maíra Mazar on November 16, 2022, at Invicta FC 50, winning via unanimous decision.[9]
Invicta FC Strawweight Champion
McCormack faced Valesca Machado for the Invicta FC Strawweight Championship on March 15, 2023, at Invicta FC 52.[10] She won the bout and title via unanimous decision.[11]
In the first title defense, McCormack faced Karolina Wójcik on October 27, 2023, at Invicta FC 54: McCormack vs. Wójcik.[12] She won the fight via rear-naked choke in the fourth round.[13]