Crystal Kaua has an outstanding resume, both as a player and coach. During her playing career, Kaua made both the Sevens and 15's trial squads for the Black Ferns and played for the Aotearoa Sevens Māori side. She also played for the Waikato and Auckland Farah Palmer Cup (FPC) teams.
Since turning her hand to coaching, she has assisted many other women to succeed in rugby in New Zealand and overseas, coaching the Mie Pearls in Japan. Kaua has also coached the Black Ferns Sevens as a skills coach and performance analyst.
During the 2022 Sky Super Rugby Aupiki season, Kaua was an assistant coach for the Chiefs Manawa before moving into the head coach position in 2023.