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The teenager accused of murdering a 10-year-old girl she knew at a country NSW property in Gunnedah was mentally unwell at the time, her trial has been told.
Now 15, she pleaded not guilty in the NSW Supreme Court on Monday to murdering the younger child on July 8, 2020.
Both children's names and the fatal injuries suffered have been suppressed by the court.
Acting Justice Carolyn Simpson was told two expert reports found the accused was acting under a "clear mental health impairment" that was undisputed.
Prosecutor Lee Carr SC said the proceedings should be dealt with under section 31 of the new Mental Health Act, which allows for a special verdict.
The teenager may not be held criminally responsible if the evidence establishes she was negatively affected by a mental health condition or cognitive impairment at the time.
The murder trial had been set down for five days but both the Crown and defence indicated there was no contention with the diagnosis.
Defence lawyer Stuart Bouveng said the court could hear from both doctors regarding his client's mental health but that Justice Simpson may be satisfied with their written reports.
Mr Carr tendered a crown bundle of evidence including body-worn footage from police at the time of the arrest and facts.
He said victim impact statements were available from the deceased girl's family.
Justice Simpson explained to the teenager that her judge-alone trial may resume on Tuesday to hear from expert evidence.
"Otherwise proceedings will conclude until I deliver a verdict," she said.
The trial continues.