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A woman set fire to a couch on a patio causing the death of another woman trapped in the burning Wagga Wagga house, a judge has been told.
Jennifer Louise Hay had been motivated by "revenge", according to the statement of agreed facts before Wagga Wagga District Court.
Hay, who was originally charged with murder, has pleaded guilty to the manslaughter of Kylie Green, 36, by an unlawful and dangerous act.
The 48-year-old also pleaded guilty to recklessly damaging or destroying by fire the residence at Tichborne Crescent, Kooringal, on February 25, 2019.
Hay, who was arrested 15 months later, faced a sentence hearing before Judge Gordon Lerve on Friday.
Emergency services were called to the home at about 6.15am, after a 41-year-old woman was awoken by the smell of smoke.
She was able to escape, but attempts by her and neighbours to rescue her sister Ms Green were unsuccessful.
Detectives previously said the women were once housemates but Hay had been involved in a "falling-out" with the other two.
Both the prosecutor Max Pincott and Hay's barrister Eric Wilson SC submitted the offending was above the mid-range of seriousness for such crimes.
Mr Wilson said his client had guarded prospects of rehabilitation, but was remorseful, had taken courses in prison and "her attitude was good".
"She is a different person to speak to now than the person shown on the body-worn video being arrested," he said.
Hay had been under emotional stress at the time, he said.
Mr Pincott referred to the grave risk of the fire to others.
He also said the revenge motive was an explanation for why the fire was lit but not an aggravating factor.
Describing the case as unusual and his being "in unchartered territory" as to penalty precedents, Judge Lerve said he would sentence Hay on December 13.