Davies (17) broke the women's 17 years record by 187 points and the women's 18 years record by 37 points with her 4337-point haul.
The St Hilda's Collegiate year 13 pupil beat Natasha Eady, of Auckland, by 213 points.
Eady won the 200m and 800m but was outclassed by Davies in the 100m hurdles, high jump, shot put, long jump and javelin.
Davies also won gold in the senior girls shot put at the national secondary school championships in December.
Davies will compete in California with a New Zealand secondary schools squad in April, but has her sights set on winning some more medals at home before then.
She will compete in the Otago secondary school championships next weekend at the Caledonian Ground, and the national track and field championships in Wellington next month.
