And even as she looks to provide spark for the Roosters from the bench in Sunday's NRLW grand final against hometown club Brisbane, the front-rower is still protesting her innocence.
"I was also more of a touch football girl … but I was spending too much of my time on the sideline," she told AAP.
"I was really tall and lean when I was younger and when I played against girls my age there was a height and weight difference and they classed me as too aggressive.
"I would have to play up an age group, so it got to the point where I was asked to play a footy trial and that's where I fell in love with it.
"The contact, having the ball and running it straight at people is so fun. I love coming off the back fence, that's probably my favourite thing."
Lopamaua credits her thirst for the physical stuff from growing up in Logan in a Samoan family which included five brothers.
The Roosters rated the 20-year-old's potential so highly the club would fly her down from Brisbane each weekend to play in their junior side while she was still studying at Woodridge State High School.
Lopamaua shares the same alma mater as Canberra great Josh Papalii. The school's respective male and female player of the year awards bear the duo's names.
"We're both homegrown in Logan and he's been an idol of mine. I went to school with his sisters," Lopamaua said.
"I received the Josh Papalii shield in school and that was an honour. Having my own shield in my name, my family's name, I was truly grateful."
Lopamaua missed last year's run to the grand final with suspension and had to watch on as her Roosters teammates lifted the trophy.
"It was a bittersweet moment, we won and being a part of that playing group meant the world to me," she said.
"But seeing that (from the sideline) fired me up for this season … I just really wanted to be involved.
"To have one (a premiership) at this age, honestly, I'd be over the moon, it's everything that I've ever wanted."
And if she were to achieve it on Sunday, what would we say to those who sidelined her from touch football and sent her on the path to NRLW?
"I would say I wasn't too aggressive," she replied. "You were just too soft."
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