"One of them overheard the conversation and said, 'I hope you didn't win that competition'.
"So I looked at her and I had to ask Ben what it was that I had won.
"I said nothing to her, standing still and quiet, but she knew. She screamed and yelled in the cafe and I was so embarrassed.
"I said, 'Can we wait until we get downstairs to the office?'."
Her work colleague ignored the request, proclaiming her win.
By the time she returned to work it was common knowledge.
"A lot of people at work entered the competition and as I walked in they said, 'So, you won it'."
"I never thought I'd win it - I feel guilty."
Her family immediately suggested a holiday to visit family at Aitutaki in the Cook Islands "but my first thought was to put it all on the mortgage".
Some members doubted the win was genuine until she flew to Auckland to meet Mr Nathan.
"With Christmas looming I'm doing a little bit of a spend, with the grandchildren and everything, and the rest of it will all be going on the mortgage - or a holiday."