She also plays for the Black Ferns sevens internationally and won a gold medal at the Tokyo Olympics.

[3] She competed for New Zealand in the women's sevens tournament at the 2020 Summer Olympics where she won a gold medal.

[8][9] She later competed in her second Rugby World Cup Sevens in Cape Town and won a silver medal.

[4][5] She was selected in the Black Ferns fifteens 30-player squad to compete in the Pacific Four Series and O'Reilly Cup.

[14][15] In August 2024, Willison signed a 2-year contract with the Newcastle Knights in the NRL Women's Premiership competition, starting effective immediately.