They scored seven goals to PNG's 1 (7-1) and appear favourites for the second match next week.
Striker Annalie Longo and mid fielder Amber Hearn collected two each in both halves.
At half time, goals through Longo, Hearn and Rebekah Stott and Aimie Philips took NZ to a 4-nil lead during the break.
In the second half, Longo dribbled past three PNG defenders to find the net and score her second goal for the day.
Sweeper Katie Duncan stepped up after a cross over and headed in before Longo sealed her second goal to her name.