Mathews began competing with Australia's senior rhythmic gymnastics group in 2018. At the 2018 World Championships, the group finished twenty-ninth in the all-around. This was the first time an Australian group had competed at the World Championships in ten years. She represented Australia at the 2019 Summer Universiade. She finished seventh in the group all-around, seventh in the 5 balls final, and fifth in the 3 hoops + 4 clubs final.