Suffocated by their sheer in-your-face physicality of the Black Ferns, not even the Aussies' star turn Maddison Levi, who'd scored a hat-trick in their 35-10 win over Canada in the semis earlier on Sunday, could get a look in.
Instead, it was New Zealand's own 21-year-old phenomenon Miller who delivered a masterclass as she'd done all tournament, scoring two tries and making several other key interventions in the tackle and breakdown as the Kiwis ran in six tries, including five in a first-half blitz.
The thrashing was hardly the way the Tim Walsh-coached team would have wanted to go into the defence of their Perth Sevens title back home next weekend.
This was the third time Australia and New Zealand had met in a final this season, with the Aussies hopeful of downing the reigning champions again after winning their Cape Town showdown in December.
But by the time Australia had come out for the second half, they were 24-0 down and almost out, with Miller having already pounced on a first-half restart error to score a superb solo try before delivering another tour de force to skip over for her second two minutes later.
With the speedy Jazmin Felix-Hotham also grabbing a brace of tries and Mhina Paul and Katelyn Vahaakolo racing over as well, Australia were only able to break through the shackles once belatedly with the consolation second-half score from Bienne Terita .
It was a grievous disappointment after they'd looked so impressive in their semi-final against Canada with tries from Heidi Dennis and Teagan Levi as well as the treble from Levi's big sister.
In the men's event, Australia had to settle for fifth place after failing to make the semi-finals, ending up with encouraging wins over Great Britain 26-19 and 26-12 against Spain.
Henry Hutchison completed his record-breaking weekend when he became the first Australian to play in 62 world series tournaments by scoring a try in both matches, while Aden Ekanayake scored in four of their five matches over the weekend.
The men's title went to Fiji, who won the battle of the last two Olympic champions 21-12 against France, the gold medallists from Paris.
