They will be tried next year and so for legal reasons, the Herald cannot report the full details of Keats' role.
Today the 20-year-old woman who was kidnapped and assaulted told the court she still relives what happened to her.
"It was very frightening and distressing. I feel it went on forever."
She'd never met Keats and only knew one of her co-accused.
"I felt helpless and hopeless."
The woman said she now has trouble sleeping, totally depends on her mother and can't work because she can't concentrate for long periods of time.
She's been robbed of the normal life of a 20-year-old, she said.
She also can't trust anyone and relies on her mother to judge whether someone is okay company.
Crown prosecutor Henry Steele said they accepted Keats' role in the attack was not premeditated because she didn't know the victim.
However, Steele said there were many opportunities for Keats to remove to herself from the kidnapping, which he called "prolonged and degrading".
Keats' lawyer Paul Heaslip argued his client should receive a discount for her early guilty and her remorse.
He said hers was a case of redemption and her offending was largely due to substance abuse.
Afterwards, Keats, a mother of two, was racked with guilt and disbelief in her actions.
Justice Simon Moore said she'd had many opportunities to remove herself from the "cruel and sadistic and substantial attack".
After the offending, Keats sent an associate a message saying the woman wasn't a dog "but a gutter rat".
Justice Moore said this showed she did not regret her actions when she could have helped the victim.
He also referred to a pre-sentence report in which Keats said she was so high at the time, she didn't realise the extent of the attack.
Five other people have also been charged - Nicola Jones, 28, Julie-Ann Torrance, 42, Cameron Te Hau Kareti Tautau Hakeke, 33, and Wayne Blackett, 39. One person has name suppression.
Each faces various charges including attempted murder, assault with a weapon, kidnapping, sexual violation and aggravated robbery.
All have pleaded not guilty and will go on trial next year.