''[The father] made efforts to get into the car - smashing windows.''
A passing doctor immediately started helping critically injured Varnah, working on her for an hour before travelling with the youngster to Whakatane Hospital's emergency department, he said.
"He was obviously a great help. He worked intensively on the poor baby and did a fantastic job,'' Mr Hendl said.
Varnah was transferred to Auckland's Starship Hospital but died there on Sunday night.
Her 4-year-old sister was flown to Auckland Hospital, where a spokesman said she was in a stable condition.
The children's 26-year-old mother, who was sitting in the back seat with the children, was also injured and was also in a stable condition in Auckland Hospital.
Eastern Bay of Plenty ambulance territory manager Richard Waterson said the 58-year-old grandmother suffered leg injuries. She was in a stable condition, a Whakatane Hospital spokesman said.
Sergeant Ray Wylie said the serious crash unit is investigating.