She was part of the New Zealand team in the football competition at the 2020 Summer Olympics.

She scored her first international goal on her debut, against Australia at the Olympics in a 2–1 loss.

[4] She attended Rangiora High School, where she was a Deputy Head Girl.

[14] In February 2024, Rennie joined Finnish club Åland United.

[15] Rennie was part of the New Zealand U-17 team who created history by winning New Zealand's first medal at a FIFA World Cup, when they came 3rd at the 2018 FIFA U-17 Women's World Cup in Uruguay.