In the pairs competition, together with Sophie McKinlay, she won the silver medal, lost in the final to Beau Greaves and Shannon Reeves from England.

[2] O'Brien also participated in the 2019 World Masters for girls, but she lost to Wibke Riemann by 1–4 in legs, in the quarter-finals match.

Overall, her good results in few tournaments allowed her to qualify for the inaugural 2022 Women's World Matchplay.

[8] At the end of September 2022, she was selected by the national federation to participate in the 2022 WDF Europe Cup.

On the second day of the tournament, she advanced to the second round of the singles competition, where she lost to Vicky Pruim by 1–4 in legs.