The hospital last night refused to answer any questions about her role, including whether she had been under any suspension following the boy's death.
Police prosecutor Sergeant Josh Kelly said family members called an ambulance after seeing the boy at his Mackenzie home on July 20 last year.
He had been vomiting and sick in bed that morning, but was not taken to see a doctor, Sgt Kelly said.
"Further to this, the deceased child had not received any medical treatment for any illness or injury since September 2010," he said, pointing to Medicare records.
Sgt Kelly said the child had injuries including to his back, groin and legs, possibly as a result of blunt-force trauma not attributable to an accident or child's play.
He said police located a fork in the house that tested positive for his blood.
Magistrate Penelope Hay denied bail and said the case was strong given Powell's nursing qualifications and the cause of death.
Meanwhile, the Department of Child Safety is conducting its own probe into its dealings with the family, in what had been considered a "very low-risk" case.
Child Safety Minister Shannon Fentiman yesterday issued a short statement confirming the child had been living with his aunt and uncle since he was a toddler.
"If the police allegations are true, this is a betrayal of care and responsibility by his aunt and uncle," she said.
It is understood the child had a caseworker tasked with regular visits and would have also been visited by the Office of the Public Guardian. But it Is not known how regularly these visits were taking place.
The pair were arrested yesterday after a coronial investigation recommended charges.
