Ambulance Victoria is investigating why it took that long for an ambulance to reach 34-year-old Kim Broadbent at Yarrawonga on Tuesday night.

An Ambulance Victoria spokesman said Ms Broadbent was at a friend’s house when she tried to step over the powder-coated metal fence but slipped and fell. She was unable to move as a result of her injuries.

An ambulance was called at 9.42pm but did not arrive until 10.29pm.

There was no paramedic on duty in Yarrawonga that night.

A graduate ambulance officer was refused permission to attend and a crew at Wangaratta, 55 kilometres away, eventually arrived after it was refused permission to exceed the speed limit or use lights and sirens.

Volunteers supported the woman’s body during the agonising wait during which she had no pain relief and lapsed in and out of consciousness.

Ms Broadbent was flown to The Alfred hospital and was today in a stable condition.

Regional general manager Garry Cook said the response time was being investigated by Ambulance Victoria.

"There are a number of factors that may have contributed to that lengthy period prior to arrival of the ambulance though and we are only early on in the investigation of this case," he said.

"We know that there was a vacancy on the Yarrawonga ambulance on Tuesday night that we were unable to cover meaning that the responding ambulance had to come from Wangaratta."