But Lane was told she was "not special" when she reported Astill's abuse, including to a woman who was the guard's de-facto partner, a NSW MP has said under parliamentary privilege.
MP Sue Higginson told AAP Lane had consented to being identified after the Greens member named her as a witness to an inquiry into Astill's offending in an attempt to have her parole reconsidered on Wednesday.
Lane, 49, is serving an 18-year sentence handed down in 2011 for the 1996 murder of her baby daughter, whose body has not been found.
She was denied parole in 2024 because of the state's "no body, no parole" laws.
But she had maintained her innocence and had been a model inmate for almost 14 years, Ms Higginson told NSW Parliament.
"She is not in prison, she is in hell," Ms Higginson said.
"We now know she has been sexually assaulted, harassed, intimidated, abused, bullied and dehumanised by a number of state government-employed corrections officers during her time in prison, including Wayne Astill."
Astill was jailed for a maximum of 23 years in 2023 after abusing and sexually assaulting women while working as an officer at the Dillwynia Correctional Centre in Sydney.
Lane was a witness at an inquiry into Astill's offending and her evidence was relied on to convict him, Ms Higginson told parliament.
The Greens MP quoted Lane as saying: "When police came to me in the jail and asked what I could tell them about Astill, I initially thought it was a set-up. But then they said 'Keli, we know, there are so many women. We need your help'."
Ms Higginson said the state had failed Lane and left her languishing in prison because of the retrospective impact of the laws, introduced in 2022.
"Those laws were designed specifically for a man who killed his wife to marry his student: murderer Chris Dawson," Ms Higginson told parliament.Â
"It is not Keli Lane's law. To inflict it upon her is wrong."
In considering her parole in March 2024, the authority was "not satisfied that (Lane) has co-operated satisfactorily in police investigations, or other actions, to identify the location" of her daughter.
The state's parole authority was an independent body and unable to consider an application for release within 12 months of a previous refusal, Labor MP Emily Suvaal told parliament.
"The crimes committed by Wayne Astill are utterly horrific," Ms Suvaal said.
"The government is responding to the Astill inquiry and has accepted all of those recommendations."
But the government did not support Ms Higginson's motion, which was voted down in the state's upper house.
She made the revelations under parliamentary privilege, which protects politicians from prosecution during proceedings in parliament.
Lane became eligible for parole in May 2024 and her full sentence expires in December 2028.
The inquiry into Astill's offending highlighted multiple failures within the state's prison system, including missed red flags that should have prevented him being employed as a corrections officer.
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