The jury also convicted Michelle Blom of taking part in kidnapping the young woman but found her not guilty of beating or sexually assaulting her.
The attacks took place in Blom's basement after she, Jones, Torrance and Jaclyn Keates, who pleaded guilty to her part in the assaults and was sentenced to jail last December, grabbed the young woman off Auckland's Karangahape Road.
In a separate attack in April 2016, Jones was also found guilty of tasering the young woman.
Torrance had earlier pleaded guilty to attacking the woman with a taser, while the pair both pleaded guilty to attacking and robbing the young woman during the same incident.
A fifth accused, Cameron Hakeke, was found guilty of kidnapping and assaulting the woman by cutting her hair during the April attack, but was found not guilty of robbing and tasering her.
Jones, Torrance, Blom and Hakeke have been remanded in custody until sentencing on April 28.