The accused are Michelle Blom, Nicola Jones, Cameron Hakeke, Wayne Blackett and Julie-Ann Torrance and all have been charged with varying offences.
The defence lawyers say the defendants are innocent of the charges as some already admitted the roles they played in the attack.
The court heard from the woman for the first time via an audio visual link today.
She said she'd known Jones since she was 3 years old and considered her a "really good friend".
The woman also knew Torrance and Hakeke through working in the sex industry.
On April 23, the woman said Hakeke asked to buy a "Q", a quarter of a gram, of methamphetamine so she went to his house in Green Bay.
When she arrived, Torrance was there and said: "Oh hi."
The woman said Torrance replied: "Oh hi, is that all you've got to say?"
Jones then allegedly jumped out from behind the door and tackled her to the ground. Jones and Torrance then started kicking her in the head and stomach.
They told her Hakeke had gone to get a dirty needle for her.
She said they then pulled out a "stun gun" and took it in turns to taser her under her arms and between her thighs.
After she was told they were going to kill her whole family and make her watch, Jones left and Torrance smoked meth from a pipe.
She then allegedly rolled the hot pipe down her leg.
"It was excruciating. The pain was the worst pain I'd ever felt in my life."
Jones and Hakeke returned then along with Torrance they started to hack off her long hair to her shoulders, the woman said.
They also allegedly held the woman's own flip-knife to her neck and forced her to sign a piece of paper which meant she was signing over her car to them.
"I was living out of my car at the time so it had everything I owned in it."
They then all got in her car - Jones drove, Hakeke was in the front passenger seat and Torrance was in the back with the woman - and went out to the Bombay Hills.
She was let out of the car and the woman said Jones and Torrance told her to hitchhike back to her mother's place in Taupo and to never to return to Auckland.
The trial continues.