The 25-year-old Logan Park High School physical education teacher was a member of the 2007 Otago Rebels squad and is on the fringe of the Otago national championship side.
The Phys Ed A defender is one of 24 players who have been selected to trial this weekend.
But her skills are not limited to the netball court.
Calnan (1.75m) has been a member of the Otago women's basketball team for the last four years and this season finds herself in a new position.
For most of her career she has played as a "big" but has switched to a swing role, following encouragement from Goldrush coach Brent Matehaere.
Otago is well-served for forwards with the likes of Patrice McKenzie, Poppy Saker-Norrish and Zoe Cadzow.
"Last year I was a big - as it is called - but not really that big," she said.
"I've been moved out ... like a shooting guard.
"I'm enjoying the change, because it means I can play inside and out and I'm not limited to one role, which I was last year when I always ended up playing on the inside.
"This year we've got more height and bigger players. So I'm not really needed in there."
Calnan has been starting most matches for the Goldrush during the Women's Basketball Championship qualifying stage and is looking forward to the finals, which will be staged in Dunedin next month.
Otago reached the final of both qualifying tournaments only to fall at the final hurdle, with the Harbour Breeze winning both encounters.
But Calnan believes her side has more room for improvement and is confident the team can lift its accuracy.
"I've been thinking about this a lot. We didn't shoot that well against them in the second tournament ... and missed more than we should have missed.
"But we've got so much more room for improvement, whereas I feel like North Harbour were playing at their best."
This weekend, Calnan will switch her attention to the Otago netball trials.
She is passionate about netball and hopes to represent the province in both codes this year.
The pressure of playing two sports at a high level makes for a hectic life.
It it also creates the inevitable conflict.
But while she has been late for the odd practice session, she has never missed one.
"There is never enough time in the day. But I've been busy my whole life.
"At school I did almost every sport possible, so I guess I learned to manage my time."
