The 16-year-old claimed a bronze medal in the under-18 decathlon at the Oceania athletics championships.
Moffitt accumulated a personal-best of 5921 in the event.
Former Otago javelin thrower Tori Peeters also secured a medal.
Her 51.79m throw won her bronze, 3m ahead of Australian Jess Bell.
Emma McKay jumped 5.07m to finish fourth in the under-18 girls long jump. She was 50cm back from the Australian top three, but was comfortably ahead of fifth.
Dyani Shepherd-Oates also finished fourth, throwing 35.95m in the under-20 women's discus.
Canterbury high jumper Hamish Kerr provided the standout performance.
He cleared 2.30m to claim gold and equal Glenn Howard's 19-year-old New Zealand record, breaking the championship record by 10cm in the process.
New Zealand sprinters Eddie Osei-Nketia and Zoe Hobbs won the 100m titles.
Osei-Nketia (18) pipped Australian Jake Doran in a photo finish in 10.34secs.
Hobbs was the clear winner in the women's final, winning in 11.56sec Fellow Kiwi Georgia Hulls was third.
By winning their respective 100m finals, Osei-Nketia and Hobbs have met the conditions of their selection in the New Zealand team for this year's world championships.
"Everybody that had my back here knew that I could do it, but I kind of didn't trust myself," Osei-Nketia said. - Additional reporting RNZ
