Fiji took a 13-5 lead at the break through tries to Litiana Lawedrau and Esiteri Bulikiobo.
The Palais hit back just before the break, thanks to a try from Joanne Lagona.
The Palais were in again early in the second half when Debbie Kaore crossed over. This narrowed the score to 13-10.
But the home side ran away with the win with four more tries to seal a comprehensive win.
Fiji has now advanced to the next qualifying round for the 2017 Women's Rugby World Cup to be held in Hong Kong.
Photo credit: Fiji Rugby