Tupaea,18, was last seen near New World in Papatoetoe on 18 June 2024.
She was wearing a green Dickies jersey and pink track pants, and she had a nose ring, police said.
Anyone with information is being asked to contact police.
"We are keeping an open mind on her whereabouts, and ask anyone across the Tāmaki Makaurau area to please get in touch if you have seen her," a police spokesperson said.