Her parents are currently visiting New Zealand.
"We are currently working through what has happened and have begun a scene examination with staff from ESR," said Detective Inspector Gary Lendrum.
"As a result of our initial assessment of the scene a homicide inquiry has commenced.
"The deceased will be removed from the address shortly and will undergo a post-mortem later to determine the cause of her death."
Police would like to hear from any members of the community that may have been in the Maich Rd area of Manurewa last night.
Any witnesses should contact Counties Manukau Police on (09) 261 1321.