She plays fifteen-a-side and seven-a-side rugby union, and is a member of the New Zealand Women's Sevens team.

[2][3][4] Miller was a member of the New Zealand Women's Sevens team that won the gold medal at the 2024 Summer Olympics in Paris.

[7] In 2015 she was captain of the Timaru Harlequins Rugby Football Club’s under 12 team and was one of only two girls to make the South Island under 48 kg side.

[12] In 2017 Miller played for Timaru Girl’s High School in the fifteen-a-side Aoraki secondary schoolgirls competition.

In the semi-final against reigning championships Hamilton Girls’ High School Miller after earlier being sin-binned scored the winning try in extra time following a 80 metres sprint to the line.

[21] She played for Canterbury in the Farah Palmer Cup competition[22][4] but her participation was curtailed in October 2021 when in the team’s semi-final 72–24 win over Otago in which she scored two tries, she damaged a knee cartridge.

[2][4] She made her debut as a member of the Rugby World Cup Sevens squad that won a silver medal in Cape Town.

[29] On 20 June 2024 it was announced that she had been selected as a member of the New Zealand Women’s Rugby Sevens team for the Paris Olympics.

[31] Miller scored three tries over the course of the Olympic sevens competition and won a gold medal after the New Zealand team triumphed against Canada in the final, 19–12.

[12] In 2021 Miller was named a Young Sportsperson of the Year at the Trust Aoraki South Canterbury Sports Awards.