She reached her first IFSC final of a bouldering World Cup in Meiringen in 2019, where she finished sixth.

[6] At the 2020 Oceania Championships, she won the combined event and qualified for the 2020 Summer Olympics in Tokyo.

[6] At the Olympics, held in 2021, Mackenzie finished nineteenth in the qualification round and therefore did not compete in the finals.

[7] Mackenzie again won the combined event at the Oceania Championships in 2023 to earn a place at the 2024 Summer Olympics, scoring 199.9 points in its final out of a possible 200.

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