Steph is an alum of the Jack Newton Junior Golf Program winning the 2011 State Junior Medals. In 2020 Steph went on to win the 2020 Australian Ladies Classic by eight storkes as an amateur and joined the Ladies European Tour on a two-year winners exemption. She is the 10th player to do so in the 42 year history of the LET.

Following that success in 2021, Steph won her second LET title and her first as a professional. She finished the season ranked no. 3 on the Race to Costa Del Sol at just age 20.