Government staff knew a ward of the state was being raped by her father but continued to allow him access to her, the Royal Commission into Institutional Responses to Child Abuse has heard.

The woman, known as BGD to protect her identity, was a ward of the state from the age of seven but continued to live at home on and off.

She told the inquiry her father was an unpredictable and violent alcoholic and her home life was abusive and volatile.

She said her father first raped her in 1977 when she was 13.

"My father raped me almost every day and became more and more aggressive," she said.

"He would grab me by my throat; he'd say 'You'll do what I want'."

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In 1979, when she was 14, she was placed at the Winlaton Youth Training Centre.

BGD told the inquiry she first reported the abuse to welfare officer Brian Fitzgerald, but he seemed more concerned with her mother's wishes.

Key points: Girl first raped by father at 13 years of age

Girl first raped by father at 13 years of age She reported it to social workers on a number of occasions but was ignored

She reported it to social workers on a number of occasions but was ignored Department wrote to father saying staff 'did not want to make him feel bad'

Department wrote to father saying staff 'did not want to make him feel bad' Father raped her daily once she returned home, fathering her four children

She said she also reported the rapes to clinic staff during an internal medical examination and also told a number of youth workers at Winlaton.

"Some of the youth workers didn't believe me", she said.

BGD described the confusing relationship she had with her father.

"I was scared of him and wanted the rapes to stop, but I craved his affection because I didn't have anything else," she said.

"I thought being forced to have sex with my father was normal."

On numerous occasions she wrote about the abuse on personal report sheets used by Winlaton.

In one report she wrote: "My most serious problem is my relationship with my father ... I hate him and love him at the same time. I think it best I don't see him for a while."

Mr Fitzgerald told the commission due to the passage of time, his memory of BGD's case was limited.

He said he was inexperienced and unqualified to work with children at the time.

Questioned over BGD's case, Mr Fitzgerald said it was senior social workers who would have sanctioned his visits.

"Some people believed her, some didn't, and they didn't start from the position of belief," he told the inquiry.

He said he believed BGD but agreed a hostel referral signed by him was badly written, didn't reflect the harm her father posed and trivialised the abuse allegations.

Lack of action from authorities 'the greatest betrayal of my life'

BGD told the inquiry her father was still allowed to visit her at Winlaton despite her disclosures.

The inquiry heard her ward file documents revealed staff had noted the relationship was not a normal father-daughter relationship.

The inquiry heard on one occasion a youth worker sat in on a visit when BGD's father confronted her.

"My father moved into my face, put a hand on my thigh and said 'keep your f***ing mouth shut'," she told the commission.

"I consider that day as one of the greatest betrayals of my life.

"It made me feel there was nowhere to escape from him."

BGD continued to write about the rapes in personal report sheets at Winlaton.

The inquiry heard she was also granted weekend leave and her father continued to rape her at home.

Documents obtained from the Department of Health and Human Services revealed a senior psychiatric nurse at the Children's Court clinic, Michael Groome, wrote to BGD's father and informed him they knew of the rapes.

The letter stated BGD told them her relationship with her father had been sexual for sometime.

It also stated "none of us want you to feel bad, but we do want BGD to feel better about her relationship with you ...".

Woman had four children after being 'raped daily' by her father

BGD told the inquiry she never gave permission for the letters to be sent.

"By sending the letter, Groome put me in danger," she said.

She said she was angry the department protected her father and she felt they held her partially responsible.

"The department treated me like the perpetrator, not a victim," she said.

BGD's wardship ended in 1980 and she was sent back to live with her parents.

"I was put back into a situation I couldn't escape," she said.

"No-one did anything to help me."

For the next 24 years, BGD was raped on a daily basis by her father. He fathered four of her children.

In 2008, a police investigation using DNA to confirm BGD's father had fathered her children led to him being sentenced a minimum 18 years' jail.

BGD took civil action against the Victorian government, which was settled in 2011.

She told the inquiry she had never received an apology and the government refused to acknowledge they knew of the abuse before she was placed at Winlaton, despite documentation to the contrary.

Fed up with the process, BGD told the hearing she signed a deed of release in which the government denied all liability.

The hearing continues.