PNG started strongly taking a 6-0 lead at half time.
Touch downs went to Margret Luke, Marlon Stevens, Kele Lessy and Grace Kouba.
PNG continued their dominance in the second half of play with touch downs scored that included Pauline Arazi and Jenny Carol.
Cook Islands only managed one touchdown to Cahjun Willis.
In other games, Tonga beat Kiribati 10-5.
PNG will play again at 12pm once the draws are finalized.
The medal play offs are scheduled for this afternoon.