A teenage girl in state care was forced to spend a weekend in a youth detention centre after Families SA cancelled her commercial care placement, a royal commission report has revealed.

Royal commission key recommendations: Abolish single shifts

Abolish single shifts Improve child abuse report line response and assessment times

Improve child abuse report line response and assessment times Mandatory six-month probationary employment

Mandatory six-month probationary employment Rigorous performance reviews for all new staff

Rigorous performance reviews for all new staff Provide psychological service to address high stress levels in the workplace

Provide psychological service to address high stress levels in the workplace Enact standalone legislation for a screening regime

Enact standalone legislation for a screening regime Ensure a real-time monitoring system

Ensure a real-time monitoring system Amend the Children's Protection Act to give more say to children

Amend the Children's Protection Act to give more say to children Establish a child protection service at the Lyell McEwin Hospital

Establish a child protection service at the Lyell McEwin Hospital Ensure every child has a caseworker who has face to face contact once a month

Ensure every child has a caseworker who has face to face contact once a month Review staff involved in McCoole case and their suitability to stay in their roles

'Hannah', who was in state care from the age of nine to 18, had her case study outlined in the final report from the Child Protection Systems Royal Commission.

She had been abandoned by her parents in South East Asia and lived in an orphanage until she was three-and-a-half years old.

Hannah was adopted by an Australian couple when she was four years old, but they relinquished her to the care of the minister after having a troubled relationship.

Her "early childhood experiences left her with emotional and psychological challenges, with which her Australian family struggled," Commissioner Margaret Nyland said in her report.

Hannah spent two years at a residential care unit before she was placed in specialist foster care in a country town for three and a half years.

She went on to stay in short-term emergency care and residential care facilities.

When she was 15, Hannah struck up a relationship with a man ('Mr B') who was known to harbour children under the guardianship of the minister.

She went missing a number of times and was believed to be having a sexual relationship with the man.

Families SA never sent the man a cautionary letter, despite being given the power to issue written directions making adults stay away from young people, in June 2010.

Hannah eventually joined the independent living Muggy's program, funded by Families SA and run by the Salvation Army.

While a part of this program, Hannah was assaulted by Mr B multiple times and on one occasion was admitted to the Women's and Children's Hospital.

Girl sent home from hospital on public bus after assault

Once she was released from hospital, Families SA supervisor Keiron Andrews was asked to organise Hannah's return home through the Muggy's program.

He arranged for Hannah to take a taxi to the bus depot and then a public bus home.

"It is difficult to imagine a parent requiring their 16-year-old child, who had been admitted to hospital following an assault, to make their way home alone on public transport," Commissioner Nyland said.

"An arrangement of that kind would hardly have given Hannah a sense that she was cared for or that her welfare was anyone's priority."

Following this incident, Mr B was charged with harbouring a child under the guardianship of the minister, but Hannah did not want criminal charges to go ahead.

She ended the relationship with Mr B, but was soon involved with another man, 'Mr F' whom Muggy's suspected was supplying Hannah with alcohol.

Hannah's relationship with Mr F was jeopardising her involvement in the Muggy's program and when Hannah was told so, she complained to staff that Mr F was supplying her with cannabis and alcohol in exchange for sex several times a day.

Commissioner Margaret Nyland says Hannah could have avoided a weekend at the Adelaide Youth Training Centre. ( ABC News )

A report was made to the child abuse report line (CARL), but a written direction to Mr F was not made at this stage.

Hannah was soon told she needed to change her behaviour or she could lose her tenancy with the Muggy's program, risking homelessness — so she chose to move in with Mr F.

"It is impossible to determine what influence, if any, Families SA's statement that she risked homelessness without her Muggy's tenancy played in that decision, and whether she thought she had any other realistic option," Commissioner Nyland said.

Soon after she moved in with Mr F, Hannah disclosed to Muggy's workers that she had been sexually assaulted by Mr F, but felt obliged to stay with him because she would otherwise be homeless.

A report was made to CARL, and the notification was acted upon.

Families SA eventually convinced Hannah to leave Mr F's home and a cabin at a caravan park was arranged as a commercial care placement for Hannah, where she was supported by carers.

Families SA terminate Hannah's placement

But Hannah continued to see Mr F and in early 2014 again went missing, so Families SA terminated her commercial care placement.

"This decision meant that Families SA had chosen to provide no placement for 17-year-old Hannah, who was, by law, the responsibility of the minister," Commissioner Nyland said.

"On 15 February, Hannah told Muggy's staff that she was back staying with Mr F.

"She told them she had returned there because when she went home to her placement at the caravan park, no-one was there."

At this time, Hannah was subjected to a bail agreement after she was arrested for misuse of a motor vehicle.

The conditions of the bail agreement required her to live at the caravan park arranged by Families SA, but Hannah had her bail conditions changed so they required her to live at Mr F's house.

Families SA eventually sent a written direction to Mr F and the commercial care placement at the caravan park was reinstated.

Families SA attempted to have Hannah return to court to have her bail address changed, but she refused to do so and failed to show up to youth court resulting in a warrant for her arrest.

Again Families SA made the decision to shut down her commercial care placement at the caravan park.

Hannah was persuaded by Muggy's staff to hand herself into a police station, but her bail was refused and she was taken to the Adelaide Youth Training Centre because she did not have suitable accommodation.

Hannah 'never prepared for independent living'

"At this time she had very little exposure to the youth justice system," Commissioner Nyland said.

"There is little doubt that Hannah would have been bailed had a suitable placement been organised by Families SA."

After spending the weekend at the youth detention centre, Hannah was bailed and returned to the caravan park.

Commissioner Nyland said in her report Hannah was never properly prepared for independent living as was required when she turned 15 years old.

"With the majority of case management efforts focused on tracking where Hannah was and what placement options were available to her, there was little space to consider long-term planning."