Niwata was born in Osaka Prefecture on September 12, 1984. In 2000, she was promoted to Speranza FC Takatsuki from the youth team. In 2007, she moved to Urawa Reds. She retired end of 2012 season. She played 96 matches in Nadeshiko League and she was selected Best Eleven 2 times (2009 and 2010).