Checkers were assessed on their speed, presentation, customer service and accuracy as they scanned 30 items as quickly as possible, while also staying friendly and composed.
Isabel has been working at the Waikanae New World for seven months and entered the competition with her workmates for fun.
"Everyone was very supportive and were cheering throughout the competition.
"It was a lot of fun."
The winner received an HP sprocket printer, while the second place-getter won a bluetooth speaker and the third place-getter won an Omen headset.
The other checkers in the top 10 each received a $50 Prezzy Card.
There were also prizes for the best dressed team and the best supporting team.
As the winner of the Manawatū region heat, Kayla Buchanan will go on to compete against the winners of the nine other regional heats held over June and July.
Each regional winner will be mystery shopped between August and November to determine the overall North Island Checker of the Year winner and two runners-up, which will be announced in November.