During the four-hour-long assault, she had water thrown on her, was spat on, had her hair cut and was so traumatised by the sexual assault she defecated.
Hannah Sims, 21, who was renting the flat at the time, had already pleaded guilty to nine charges, two charges of indecent assault, sexual violation and assault with a weapon as well as a charge of injuring with intent to injure, threatening to kill and unlawfully detaining a person.
Before the trial, Roper, Kerr, and Olsen also pleaded guilty to some of the lesser charges including injuring with intent to injure and being party to the indecent assault where Sims rubbed her crotch in the girl's face. Roper also admitted punching the girl four or five times in the face after she was told her friend liked her ex-boyfriend.
After five hours deliberating, the jury found Kerr guilty of detaining the girl and indecent assault by removing her clothes. However, he was found not guilty of encouraging Sims to assault the girl with scissors by cutting her hair off.
Olsen was also found not guilty of the assault with the scissors but guilty of encouraging Kerr to assault the victim by hitting her on the backside with a spatula.
Olsen and Kerr were issued a first strike under the three strikes legislation. Roper does not come under the legislation as she is just 17.
Lawyer Roger Philip applied for bail on behalf of Roper. Judge Geoff Rea declined this saying Roper was likely to receive a significant prison sentence. The trio were remanded in custody until sentencing next month.
