A four time Olympian, Campbell is a triple Olympic gold medallist and a former World Champion in the 50 and 100 m freestyle, having won both titles in 2015.

Her older sister Cate is also a competitive swimmer, and in 2012, the two became the first Australian siblings on the same Olympic swimming team since 1972.

[6] Campbell's family moved from Malawi to Australia in 2001 and she and Cate joined the Indooroopilly Swimming Club in Brisbane that same year.

At the World Championships, she teamed up with Cate, Emma McKeon and Alicia Coutts in the 4 × 100 metre freestyle relay where they won the silver medal, finishing 0.12 of a second behind the United States.

She finished fourth (timing 51.65) in the finals of the 100-metre freestyle event, behind Femke Heemskerk, Ranomi Kromowidjojo and Sarah Sjöström.

[17] After an 18 month break from swimming following the Tokyo Games, Campbell returned to the pool under new coach Shannon Rollason in Canberra.

[18] Campbell has completed her Business Degree at QUT Queensland University of Technology, ,[19] majoring in Public Relations.