But that's a far cry from the fullback who felt like she was walking into a new school after signing with the Queensland Reds at the start of this year's Super Rugby Women's season.
Since switching from her dominant sevens game to the 15-a-side format, Caslick has been a mainstay for the Reds, leading them to a fifth grand final where they hope to win a first title on Saturday.
Caslick plans to add a Super Women's premiership to her trophy cabinet, which already includes an Olympic gold, world cup gold and multiple world series titles when her Reds take on the NSW Waratahs in Sydney.
"It (15s) felt like going to a new school and it was pretty scary at the start. At sevens, it's been my home for almost 12 years," Caslick told AAP.
"We have a limited time to show the coaching staff and selectors for the Wallaroos what we can do.
"I'm pumped. It's my first season of Super W and I get to play in a grand final. We've had a really good few games leading into it."
History is against the Reds however, with the Waratahs winning all 12 of their head-to-heads, having never lost to any Australian side before.
A win would also mean they claim their sixth Super Rugby women's title in eight grand final appearances, and second in a row.
The Tahs dominated the Western Force 54-17 with a Georgina Friedrich hat-trick to qualify for the final last week.
But, the win was overshadowed by injuries to captain Piper Duck (shoulder) and Wallaroo backrower Leilani Nathan (knee).
Nathan's sister, Nicole will replace her in the back row, while 17-year-old Ruby Anderson takes Duck's No.8 jersey.
Queensland were an attacking force in their 54-40 semi-final victory against the Fijiana Drua, but they did leak 35 unanswered points in the second half.
The Reds will be without key backrowers Jemma Bemrose (ankle) and Sarah Riordan (knee).
Zoe Hanna and Maraea Tupai will start in their place alongside six other replacements.
The Waratahs also have eight changes for the grand final.
But stand-in captain Emily Chancellor said their loss of players - even Duck - hadn't changed her team's game plan too much.
"The only thing that changes is the fact that I'm the one that talks to the ref a little bit more, and I give the chat just before we jump out on onto the field," Chancellor said.
"We haven't given a complete performance this season.
"We've done a nice build from round one all the way through to that semi final last week.
"But we've still got more to give, and that's going to come out this weekend."
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