Her placings were third, sixth, fifth, fourth, 10th, second and fifth in the 27-strong fleet.
Millar placed second female in the O'pen Skiff at last year's event.
Racing was held in patchy winds on Day 1 but the event organisers had to pack in more racing to allow for the arrival of Cyclone Gabrielle.
At the prize-giving, special mention was made of Millar being the only O'pen Skiff sailor in the Gisborne region and rarely having the benefit of close skiff racing on home water.
Her build-up benefited from the presence of a young German female sailor, Lioba Rimmele, who was in the district on holiday. She jumped on to a spare boat and raced with Millar before the nationals.
Millar is eyeing a possible defence of her Wellington O'pen Skiff title in March, then the Starling Class Nationals to be held at Manly around Easter.
She has offered thanks to her sponsor Eastland Port, the 2023 Tairawhiti Rising Legends and the Gisborne Yacht Club for their support.
' The capital O and apostrophe of O'pen is in reference to the Optimist class boat, a popular youth sailing dinghy that was built in 1947 at the request of the Clearwater Florida Optimist service club. Somewhat heavy and slow, the Optimist class design included buoyancy bags to help float the vessel in case of capsize. An O'pen Skiff needs no such support; with an open transom, water flows out the rear and never stays in the hull during sailing or in a capsize, so the junior boat is easy to handle and right. First produced in 2006 as the O'pen Bic, it was renamed the O'pen Skiff in 2019 and is a popular sailing vessel for children and teenagers. (From San Diego Reader and Wikipedia)