Aged 17, O'Connor competed for Northern Ireland at the 2018 Commonwealth Games, finishing eighth in the heptathlon.

[3] She won a silver in the heptathlon at the 2019 European Athletics U20 Championships in Borås, Sweden.

[7] O'Connor became the first Irish heptathlete to compete at an Olympics[8] when she finished 14th at the 2024 Paris Games.

[9][10] She set a new Irish indoor pentathlon record of 4,683 points at the Tallinn Combined Events meeting in Estonia in February 2025.

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