At the age of 21, Dinnen was called up for a training camp with the Wallaroos to prepare for the 2014 Women's Rugby World Cup.[1][2] However, it took her ten years before she made her debut for Australia.[3]
Having returned to her best form in 2021, she was voted Super Rugby Women's Player of the Year.[1][4] She was naturally called up to prepare for the 2021 World Cup, but the competition was postponed due to the COVID-19 pandemic, and she also became pregnant.[3][5]
In early 2022, she gave birth to her daughter Zoe.[2][3] She only had five months to prepare for the delayed World Cup in New Zealand. She tried, but her body couldn't cope with the strain of intensive training, after a conversation with the Head coach at the time, she decided to withdraw from playing.
In 2023, an ankle injury forced her to miss the Super Rugby Women's season.[3] She searched for a team that would allow her to combine rugby and motherhood, the Western Force offered their services, so she moved to Perth with her husband and two-year-old daughter.[1][5] There, she rediscovered the joy of playing that she had unknowingly lost.[1] She previously played for the Queensland Reds team.[5][6]
At the end of summer 2024, she was selected for the Australian national team for their tour of Europe and the WXV 2 tournament in South Africa.[3][4] On September 14, she made her international debut for the Wallaroos against Ireland in Belfast.[2][3]