Kopua became a member of the New Zealand national netball team (the Silver Ferns) in 2004, making her on-court debut in 2005 against Barbados.

[1] In 2008, she co-captained the team with Laura Langman, stepping into the role of acting captain later that year following an injury to Julie Seymour.

[2][3] In domestic netball, Kopua played her entire career with the Waikato Bay of Plenty Magic, starting in 2003.

[7] In 2017, still rehabing from her surgery, Kopua announced her retirement from the Silver Ferns, stating she would return to the Waikato Bay of Plenty Magic in 2018, but would not be available for international selection.

[8] Kopua was coaxed back to the national team by Noeline Taurua for the 2019 Netball World Cup.