The Player of the final mixed style with substance on Saturday afternoon, exposing the right side of the Reds' defence, providing energy through the middle of the field and scoring a try.
Her performance also came in front of Wallaroos coach Jo Yapp, as a selection announcement for the Australian side looms ahead of their first Test against Fiji on May 3.
But Miller is solely focused on celebrating her triumph with the Waratahs, as her side remains unbeaten against Australian opponents and has lost only four times in their seven-year history.
Miller said her emotions were "all over the place" after the match.
"I didn't even know the buzzer went and everyone was getting around each other," Miller said.
"Women's rugby is only getting bigger, and we've got to jump on the ride and propel it further.
"It was a massive team effort. We showed a lot of resilience.
"I try to not focus on the Wallaroos. I'm just focusing on my craft, my game, and what I can do for the Waratahs."
Georgina Friedrichs had another superb performance, scoring twice, while fullback Caitlyn Halse assisted two tries for the Tahs.
NSW also completed their premiership defence missing key backrower Leilani Nathan and captain Piper Duck due to injury.
Two early tries, and two late tries meant the Reds were always up against it as they lost their fifth grand final and remain on the hunt for their first title.
Prop Eva Karpani was a positive glimmer as she equalled the most tries scored by a Reds player in a single season (seven).
Queensland coach Andrew Fraser admitted his side was outmuscled by the premiers, but saw the 2213 strong crowd as a step in the right direction for women's sport.
"They (Waratahs) showed a lot of cohesion in the outside channels, and it wasn't our day sadly," he told AAP.
"There were some good individual efforts that shine a light for the program for years to go.
"Today was a great advertisement of women in sport. We've got Olympic gold medallists here at North Sydney Oval.
"The Women's game is well and truly alive in Australia and hopefully we see a competitive Wallaroos at the end of the year."
The Tahs dominated from the outset, gaining the ascendancy with two tries in the opening 21 minutes to Friedrichs and Kaitlin Leaney.
Queensland didn't look like the side that scored 54 points the week before, as it took them 25 minutes to reach the Tahs' 22.
Karpani's close-range try in the 27th minute reduced the deficit to five points, but that was the closest the Reds would come to the Waratahs.
Although both teams went try for try in the second half, two late five-pointers helped the Waratahs seal the win.
NSW will next play in the first Trans-Tasman championship game against the winner of the New Zealand Super Women's competition on Thursday evening.
