She is from Greenbank, Queensland and attended Arkansas State University where she captured school records in the pentathlon and heptathlon and was a three-time All-American.

She was also named the 2023 Sun Belt Outdoor Performer of the Year, and had the distinction of winning four conference championships in four different events; the outdoor heptathlon in 2023, the javelin in 2022, and the indoor pentathlon and indoor 60m hurdles in 2020.

[2][3] Newton-Smith recovered from missing the 2021 season with an Achilles injury to become the number one ranked College indoors pentathlete in the United States with a personal best score of 4,356 points in Lubbock, Texas in January 2023.

[4][5] She won the 2024 Australian Athletics Championships in April 2024 with a personal best score of 6180 points in Adelaide.

[6] She won gold at the 2024 Oceania Athletics Championships in Suva, Fiji in June 2024 with 6070 points.