Career
She competed for the New Zealand women"s national field hockey team (the Black Sticks Women) between 2001 and 2008, including for the team at the 2004 and 2008 Summer Olympics. Niniwa has a younger sister, Aniwaka, who was selected for the Black Sticks Women in November 2012. 2001 – Champions Trophy, Amstelveen 2002 –, Manchester 2002 – Champions Trophy, Macau 2002 – World Cup, Perth 2003 – Champions Challenge, Catania 2004 – Olympic Qualifying Tournament, Auckland 2004 – Summer Olympics, Athens 2004 – Champions Trophy, Rosario 2005 – Champions Challenge, Virginia Beach 2006 – World Cup Qualifier, Rome 2008 – Summer Olympics, Beijing.