Coming up against the Tamworth Kangaroos, the Saints avenged their 2018 grand final loss by accounting for the Roos 5-6-36 to 1-1-7.

The victory was set up by a solid second-quarter performance, which saw the Saints kick away and leave the Roos scoreless for the remainder of the match.

Saints' captain Clare McCosker said the victory was a testament to "the support the entire club gives to the women's team".

"Everyone at our club has gotten right behind not just us, but all four of the teams we have at the Saints," McCosker said.

"It feels so great to make up for last year's grand final loss and to do it in front of so many of our supporters is just really special."

Roos' coach Brett Douglas lamented his side's second-quarter performance, saying it cost his side the match.

"I was really happy with the way our girls started the game - kicking the first goal, but from there, we just couldn't seem to get it going our way," Douglas said.

"We had a couple of players go down with injuries and had a few things not go our way throughout the match.

"But, full credit to the Saints, they are a really well-drilled side and fully deserved to go through the season undefeated with a premiership."

Douglas said he was proud of his side's ability to "hang in there" throughout the game.

"We always knew Inverell were going to be tough to beat, but we said in the pre-game speeches 'beware the wounded Roo' and I think the girls showed a lot of heart today [Saturday]," he said.

"I'm proud of the girls' efforts today and I think they are already listening, learning and getting themselves ready for next season."

Despite going through the opening term goalless, McCosker said the side remained calm and set about gaining the upper hand.

"We always knew the Roos were going to come out hard, so before the game we spoke about being a four-quarter team and focusing from the first bounce until the final siren," she said.

"I don't think we dropped our heads after that start because we knew we could come back and sure enough we kept chipping away until we did."

McCosker said her side was already looking ahead to next season.

"Hopefully this win will keep our group together and hungry for more success in the future," she said.

"Winning this grand final was a dream and something I think we will all remember for a long time."