Police and ambulance were called to the scene where the girl was placed in an induced coma before being airlifted to John Hunter Children's Hospital where she remains in a critical condition.
According to police, the circumstances surrounding the incident are unclear and investigations are still underway.
The news follows reports from the weekend when two toddlers aged 1 ad 2 were found dead inside a hot car at their home in Brisbane.
Their mother, Kerri-Ann Conley has been charged with their murder.