Officers were still working at the scene, and it was understood they would be there all weekend.
Police staff are notifying the family of the dead woman, who has not been named publicly after she was found dead by emergency services shortly after 7.30pm last night.
Nobody else was being sought in relation to the incident.
On social media, several people said they heard gun shots about the time of the incident.
One wrote: "Awful we heard shots as police cars went past. Very sad."
Another person wrote: "Heard them too."
Last night, resident Glenn Kingston said he had seen four police cars race down the street about 7.30pm.
"We just saw police cars and ambulances and so on rushing down streets."
The street fell quiet afterwards.
One neighbour said both the women were Pakeha. She did not know their relationship to one another.
"They moved in maybe over a month or so ago, maybe a little bit longer. Those neighbours were very quiet, we didn't hear [anything] ... we've never really seen them," she told Fairfax.
In court this morning, defence counsel Chris Tennet sought interim name suppression for the accused, as he said he was still trying to track down her parents.
This was granted by Justice of the Peace Ann Clark, Fairfax reported.
The woman's next appearance is in two weeks in the High Court, but Tennet told the court he was trying to move the date forward.
He said she has never been in court before or arrested.
Sergeant Garth Coffey sought interim suppression of the victim's name, which was also granted while family members were informed.
Name suppression would be reviewed at the accused's next appearance, or by the High Court.
Murder carries a maximum penalty of life imprisonment.
