Students at the school sit qualifications up to three years early so they can focus on a more "practical" education.
In their senior years they are taught vocational subjects -- females learn sewing, cooking, laundry and childcare while males learn carpentry, engineering and farming.
The school is private but gets some state funding. Last year it received $200,000, up from $170,000 in 2011.
Ms Delahunty has said that while the letter of the law is being followed, the spirit that children should get a broad education is not.
Yesterday, she stood by that criticism after she and a member of the Greens media team visited the isolated community at Lake Haupiri, West Coast.
"The sticking point that remains is that for them, education is for the functionality of their community ... It is not my idea of a broad, quality education in terms of the high-school age group. We agreed to disagree on that.
"They believe the world is facing imminent meltdown, so a self-sufficient community where everyone plays a role and everybody has their part -- basically they are trying to create safety for themselves.
"The guys go and work in the agriculture area, the girls do office work, laundry or early childhood, it is a world that's difficult to relate to because it is so gendered. It is very difficult to imagine how it could be if you don't fit the box there."
Ms Delahunty said she spoke mostly to women during the visit, some of whom said they did not want to learn about science and other subjects as they would rather focus on raising a family.
"These women talked about how they come home and welcome their husband back from work. I said, 'Well, that's what my partner does, he cleans up the house and makes my dinner. The world doesn't end'."
Ms Delahunty left with gifts of flowers, framed photographs of children, and homemade cheese and apple juice.
Gloriavale could not be reached for comment.
