She also plays for the Black Ferns internationally and was a member of their 2021 Rugby World Cup champion squad.

[3][4] She appeared for the Black Ferns 15s at the Takiwhitu Tūturu Pure Sevens tournament in Hataitai Park, Wellington.

[5] Du Plessis made her Black Ferns debut off the bench on 4 November 2020 against the New Zealand Barbarians in West Auckland.

[17] Du Plessis returned for her second season with Matatū for the 2023 Super Rugby Aupiki competition.

[2] On 8 July, she scored a brace of tries in the Black Ferns 21–52 victory over Canada at the Pacific Four Series in Ottawa.