The report's existence was revealed during a police informant's evidence as Kawsar Ahmad, 54, applied for bail in Melbourne Magistrates Court on Friday.
Ahmad was charged with slavery offences in May after returning to Australia with other family members of former Islamic State fighters.
She is the mother of fellow alleged ISIS bride Zeinab Ahmad, 31, who was refused bail on Wednesday.
Prosecutors allege Kawsar Ahmad migrated to Syria with her husband Mohammed and their children to join Islamic State around January 2015
It's alleged while in Syria in 2017, Mohammed bought a teenage girl as a slave for $US10,000.
The girl was repeatedly raped and beaten by Mohammed, including an incident where she was hit and dragged down two flights of stairs by the hair, the court was told.
It's alleged Ahmad agreed to the purchase and then treated the girl badly, often threatening her with beatings or the prospect of being sold.
Prosecutors allege Ahmad would ask her husband to assault the teen and while she never assaulted the girl herself, she would often scream at her over trivial matters.
The court was told Ahmad also allegedly shared social media posts in 2016, calling for prayers to Allah to defeat non-believers and sharing quotes from an al-Qaeda figure.
In opposing bail, Detective Senior Constable Marc Clendenning told the court Ahmad was a risk to the community because she had joined IS and remained in Syria.
The detective said he was concerned she would spread extremist ideology to other people if released back into the community.
Under questioning from defence barrister Peter Morrissey SC, the detective agreed authorities undertook a risk assessment of Ahmad before she returned to Australia.
Chief Magistrate Lisa Hannan said it was the first she had heard of the report and it was clearly relevant to her own assessment of risk.
Prosecutor Andrew Sprague said his team did not have the report, rather it was in the possession of the Australian Federal Police.
But other agencies were involved and they would need time to review the report in case they needed to make public interest immunity claims, Mr Sprague said.
He said his team would start that process immediately but it was unclear how long it would take to hear back from the agencies.
Judge Hannan adjourned the bail application, saying it was clear the information was highly relevant to her decision so she could not proceed without learning what the report said.
The hearing was adjourned to Monday morning and Ahmad was remanded in custody.
12°C