The Central Hawke's Bay Swim Club member defied the odds to claim two gold medals in the 50m and 100m breaststroke races.
In doing so she smashed the eight-year Hawke's Bay-Poverty Bay records of Katie Bone, of Napier.
In fact, Reidy was 0.9 seconds shy of smashing the New Zealand record when she stopped the clock at 1m 09.54s in the 100m event, 46 splits ahead of silver medallist Abbie Johnston, of Auckland.
She clocked 32.23s in the 50m dash to finish 33 splits in front of Bronagh Ryan, of Porirua.
She was the top qualifier in both heats to claim the sought-after middle lanes.
England-born Zoe Baker holds the New Zealand 50m breaststroke record with a time of 31.21s set during a heat of the New Zealand Youth and Open Championship in Wellington on April 1, 2005.
A disgruntled Baker had switched allegiances to New Zealand in 2005 amid claims Great Britain didn't support short-course swimmers.
The Commonwealth gold medallist, now 38, crossed the floor back to her country of birth in 2011. She is also a former four-time world record holder.
Anabelle Carey, 25, of Nelson, holds the NZ 100m breaststroke record in a time of 1m 09.26s set at the NZ World Championship trials in Auckland on March 29, 2005.
The Athens Olympian, who helped the New Zealand team to fourth place in the medley relay at the 2006 Melbourne Commonwealth Games in Australia, had clocked a record-breaking time of 4:06.30.
The pedigree of Baker and Carey puts Reidy's feat in perspective.
The former CHB College pupil knows how psychologically daunting it was sometimes as a youngster going to swim meets where metropolitan pedigree rivals exuded an air of supremacy.
It wasn't easy for Reidy at the nationals after collecting a silver and bronze in the same races in 2012.
She was attending Police College in Porirua from August last year and had to forgo swim training for several months.
"They had a pool there but it was closed down because of the earthquakes."
Reidy, who is on frontline duties in Hastings as part of her "apprenticeship", says she didn't have any qualms about competing and had opted to channel her energy into the breaststroke discipline.
"I hadn't raced in a while and lacking a little bit of confidence but the plan was always to win."
She has been competing at the Open nationals since 18 but gave the short-course champs a miss last year because of career demands.
No doubt, while there is little correlation between swimming and the police beat she feels the sport keeps her fit.
Reidy hastens to add the small-town success is also a credit to her coach, Aidan Withington.
"Aidan's really good because my training sessions are at odd times with the shift work.
"He's set aside my programme to just focus on breaststroke."
Equally pivotal are her sponsors from the CHB town - Aqua Management, Amcal Pharmacy and Jacob's Construction.
She hasn't had the opportunity to see if she's flirting with the Fina A and B times to harbour realistic dreams about making the cut for Commonwealth Games or the Olympics.
"If I can make the B time then I can qualify for the relay team so that'll be nice, too," she says, acknowledging the stringent qualifying times aren't easy to attain.
However, Reidy fancies her chances of getting on the international stage through her employment.
There's the Police and Fire World Games in Fairfax, Virginia, in the United States in June next year but the cost may prove to be a deterrent.
A more do-able proposition is the Australasian Emergency Services Games in 2016.
