Minnie-May, 18, is living in Auckland, studying for a bachelor of business at AUT, and friends and whanau encouraged her to enter the competition.
She said her time at the boot-camp in Auckland included a media workshop, make-up classes and a professional photo-shoot.
"I've always wanted to do it, so now to be a part of it, it's great."
She was Northland's Top Model at the 2008 Bernina Northland Fashion Awards.
Priscilla grew up seeing her mother being part of beauty pageants, and now it is her turn to participate.
She said she was over the moon to be part of the top 20. She hopes to have a career in the performing arts or in the media.
Executive producer Nigel Godfrey said this year's competition was a totally different experience from the Miss Universe NZ of the past. "I don't live in pageant-land. This is a new invention of the competition, it's an entertainment show."
The winner will be the girl with the highest score, made up of 50 per cent judges' score and 50 per cent text votes.
She will go on to represent New Zealand at the prestigious Miss Universe contest in Moscow later this year.