Aroha Ireland was among a group of teenagers attacked by gang members after her farewell party.
The 17-year-old poster child of National's 2008 election campaign, who was preparing to leave for Australia, had been saying goodbye to friends at a party last Saturday night.
But her friends were attacked by gang members with weapons.
At least one teenager was knocked out in the melee.
Writing on Facebook, Aroha thanked friends who "stayed behind to help out with those f***** black powers".