Prom Queen jumped, led and proceeded to blow her rivals away in the day's 2-year-old race under Collett at Riccarton Park on Saturday.
Collett turned Prom Queen loose inside the last 300m and coasted to victory by nine and a half lengths.
The $1.40 hot shot clocked 59.24 on a track rated Slow 9 leaving her effervescent Ruakaka trainer Kenny Rae wondering how good she might be.
"She just keeps on improving," he said of the Super Easy filly, winner of four of her five starts. "We'll carry on to the stakes race back at Riccarton in two weeks – the Champagne Stakes and then we might think about a trip to Brisbane."
The target would be A$100,000 fillies race, the Listed Bill Carter Stakes over 1200m at Eagle Farm on June 3.
After a few attempts, Collett was able to get the monkey off her back finally winning her first race aboard a Rae-trained runner and she drew praise from the trainer.
"Sam settled her beautifully, it's the best she's ever settled in a race," he said.
Collett's two wins has elevated her tally for the season to 58, her previous best was 56.
"It's been a great year and who knows, if things keep going well I might be able to add another 10 or so before the end of the season."