2023 In round 1, Koster made her debut coming off the bench for the
St. George Illawarra Dragons against the Newcastle Knights at
McDonald Jones Stadium. Koster played 8 games for the
Dragons scoring 2 tries as well as getting the NRLW Emerging Talent award. On 4 October, Koster resigned with the
Dragons until 2025.
2024 On 11 January, Koster was selected for the under 19
New South Wales Blues. In round 4, Koster made her season debut after a shoulder injury. Koster finished the season playing 6 games and scoring 3 tries. Koster was selected to play for the
Australian Prime Minister's XIII.
2025 On 15 February, Koster scored a try on debut for
Indigenous All Stars in their 20-18 win against the
Maori All Stars. On 4th April 2025 Koster re-signed with the Dragons until the end of the 2027 season. ==References==