"I can't even speak," she said while overcome with the thrill.
"We own him and I love him so much.
"He's going to win the Guineas now."
Ridden by Ben Thompson, Yellow Brick started at $7 and scored by 1¼-lengths over the Toby and Trent Edmonds-trained Alpine Edge ($15) with Steady Ready ($5.50) 1½-lengths away in third.
"Winning five from six (starts), it is not easy to do," Thompson said.
"His biggest risk today was against older horses but he lifted the bar and delivered."
The form proved telling from performances of other runners at Doomben in black type races earlier in the day.
"He trialed and beat home Count Da Beans and other decent horses last Tuesday and just having that experience and having ticked that box after having had a trial as well as he did pulling up as clean as a whistle, I thought I could pretty much do anything on him and the barrier (nine) wasn't going to determine how we go."
On the track, the King Of The Mountain exceeded Thompson's expectations.
"It's unreal. Obviously so much hype around this (race) and I wasn't sure what to expect (being) New Year's Eve," he said.
"It's a local affair but it is special. It makes you think that winning a big race and getting a slot in a race, when it comes to a slot race, it is a realistic task for Queensland trainers.
"Kudos to Tony and Maddysen Sears for preparing the horse the way they have."