Cynthia Rennolds, who had organised the Cactus Moon Linedancing event, also spoke to AAP saying she could not believe the four friends were all gone.
"To lose four in one fell swoop it is very hard to get your head around," she said.
She added it is "too soon" to decide whether the annual linedancing event will be held again.
Assistant Commissioner Doug Fryer said the sight of the driver holding the passenger's hand would haunt him for a long time.
"The elderly women had no chance whatsoever, there was no opportunity to take evasive action," he said.
The four women were driving a Kia Rio on a clear stretch of road in Navarre when another car came straight through an intersection and T-boned them.
People from a nearby house ran to their rescue before emergency services arrived at the scene.
The driver of the other vehicle, a 64-year-old woman, was taken to hospital where police will speak to her.