A woman who preyed on and raped a fellow inmate will be eligible for parole sooner after appealing her sentence.
Brooke Amanda Degn was behind bars for armed robbery and drug offences when she sexually assaulted and raped the "new, inexperienced inmate", Chief Justice Catherine Holmes said on Friday.
Degn was aged 37 and 38 at the time.
Four sexual assaults occurred after the mother-of-three and other inmates removed the woman's bath towel or underwear.
On one occasion another inmate grabbed the woman around her legs, making her fall backwards and hit her head.
"She fell in and out of consciousness, and was left with a swelling to the back of her head, pain in her head and a bruised shoulder," Chief Justice Holmes said in the Appeal Court judgment handed down on Friday.
The rape occurred when the woman was restrained and digitally penetrated.
The court heard Degn had been a methylamphetamine addict and in and out of jail since she was 30.
She had been eligible for parole for the earlier offences in January 2018 and due for release last month.
But in June last year she pleaded guilty to offences relating to the attacks on the inmate before being handed a head sentence of six years behind bars.
Chief Justice Holmes said it seemed probable Degn had little prospect of obtaining parole once officers had been told about the sexual assaults that occurred in July and August 2018.
"In that way, then, she seems to have begun to suffer the consequences of the offending well before she was sentenced in July 2020, and to that extent it can be said that her custody from August 2018 was at least in part attributable to the offending for which she was sentenced," she added.
Her parole eligibility date was brought forward by 12 months after Degn took her case to the Queensland Court of Appeal.
Australian Associated Press