"She was judged by the way she looked (skin colour and the way she dressed) she didn't have a suit on or have a briefcase or whatever but we do pay the same amount as those business people to travel and use the premium lounge," the daughter wrote.
The daughter said the staff took a long time double-checking the business class ticket, then still tried to direct them to the self-service kiosks.
At this point, the daughter said her mother began to cry.
"My mum is such a softie and she wasn't feeling too well, starts tearing up."
The daughter said she told the staff her mother was blind in one eye and needed help getting from the Premium lounge to the aircraft, but that they were once again met with resistance from staff.
"I was so disappointed. I was more shocked," the daughter wrote.
"This shouldn't be the way they treat customers despite what they look like or which class they fly."
An Air NZ spokesperson said they were concerned to see the Facebook post circulating, and have not only investigated the incident, but also been in touch with the family directly.
The spokesperson said the A320 aircraft the woman was travelling on didn't have a Business Premier cabin, but that the woman held a Works Deluxe ticket which included Premium Check-in.
"Our staff on duty at the time were very concerned to learn of the customer's concerns, they did not intend to be anything other than welcoming and do not recall any conflict or disagreement."
"The CCTV footage from the check-in area at the time gives no indication of any conflict taking place."
The spokesperson said they sincerely apologised for any miscommunication during check-in.