They were unable to turn that into more points through a combination of errors and not sending the ball wide more often, their big forwards instead trying too many one-up runs.
Star winger Honey Hireme was not used enough although when she did get the ball, she made big gains and ended up scoring two tries in quick succession (13th and 20th minutes).
The Jillaroos extended their lead to 12 points in the second half, helped by their opponents’ mistakes and ill-discipline.
The Kiwi Ferns dug deep late in the game with a try to Raecene McGregor and had their chances to close the gap even more only for Caitlin Moran to pot a fatal field goal.
Kiwi Ferns captain Laura Mariu and Hireme indicated they would be retiring after this game.
Hireme ended the tournament with 13 tries while Mariu led the New Zealand team in metres gained (130) and tackles made (28) in the final.
Mariu played in five world cup tournaments, winning three of them.
Before the final, Kiwis coach Tony Benson talked about the huge sacrifices his team made to get to the final, including not being paid, training three times and week and travelling long distances to get to training.
That was in contrast to the financially supported Jillaroos, who had contracts, high performance programmes and regular team camps.
“They’re superb,” Benson said of his squad.
“They don’t ask for anything and appreciate everything they’ve got.”