The Tony Gollan-trained filly, a $100,000 Inglis Australian Easter Yearling Sale Book 2 purchase by Simon Miller Racing, scored a three quarter length victory in Saturday's Mode Plate to become the 10th stakes winner for her Eureka Stud-based sire Spirit Of Boom.
Oh Five Glory, a daughter of Unencumbered, finished three quarters of a length second with another half length back to Euro Belle in third.
The win was also the biggest for in-form apprentice Stephanie Thornton since she switched to Queensland.
"Sugar Boom goes really well for female riders and Steph is the best around at the moment. She won on Sugar Boom at the Sunshine Coast and I had no hesitation putting her on today even though she couldn't claim," Gollan said.
"Sugar Boom is a much tougher filly this campaign. She has really bloomed over her break and I think she can now live up to her early potential."
Sugar Boom will now be aimed at the Gold Edition Plate (Listed) at Eagle Farm in two weeks.
In 7 starts Sugar Boom has now won 4 times and placed another 2 for earnings of $161,050. She is out of the Group-placed Pins mare Acupuncture and her second dam is Quack, the dam of stakes winners Anatina and Pricked, who is herself out of Luskin Star mare Mother Duck.
The Eureka Stud-based sire Spirit Of Boom, who finished second to Zoustar in the leading first season sires standings by earnings in Australia in the 2017/18 season, stood for a fee of $44,000 (inc GST) this year. He stood for $55,000 in 2018 having covered his first 4 books of mares for only $11,000. Spirit Of Boom has 10 lots catalogued for the Magic Millions Gold Coast Yearling Sale in January.