"It was a mobile number that rang that looked like any other number - I wasn't sure it was real to begin with," she said.
After confirming its authenticity, the store owner immediately started a deep clean of most surfaces and put up notices around the store to inform customers that the business had been confirmed as a location of interest.
But despite remaining open and taking precautions such as erecting a perspex screen and keeping distanced, it appears the public are apprehensive to visit.
"It's been tough the last 24 hours, we've probably lost about a quarter to a third of customers.
"People are just worried to come in - but I'm fully vaccinated and wear a mask whenever I'm in the shop, there's no need to be worried."
Currently, the dairy is one of only two locations of interest in Whanganui - the other being the Kai Iwi Beach public bathrooms.
The Ministry of Health initially indicated more locations of interest were likely, but has since said other locations may not be listed.