Hailing from Mackay, a small town in North Queensland, Australia, Harris entered the world of swimming at the age of 3 when she began learn-to-swim lessons. Harris’s passion for swimming was ignited at the age of 5 when her mother became a swim teacher.

Harris received a gold medal at the 2017 Youth Commonwealth Games, along with a silver medal and two bronze medals at the 2019 Junior World Championships. Harris made her Olympic debut at the 2020 Tokyo Olympics, earning a gold medal and setting a world record in the 4x100m freestyle relay.