"Here in New Zealand we are doing everything possible to support families, directly affected clients and our people during this difficult time.
"This includes having spoken with and providing assistance to our colleague's parents as well as the parents of the two New Zealanders who were injured in the crash.
"We offer our deepest condolences to her family - our heartfelt thoughts are with them.
The van the New Zealanders were travelling in was heading to a surf beach in Lombok when it went over a cliff, rolling several times.
Emergency services spent an hour trying to free the New Zealanders from the van which had plunged into a riverbed.
Lombok International Medical Service's Dr Caahuua said two of those in the van, the New Zealand woman killed and an American tourist, were taken to the service.
"The car has slipped on a hill and [gone] into the river. The people helped get the people out of the car. Many people were helping."
The New Zealand woman was taken by ambulance to the medical service, but was "dead on arrival", he said.
Turner said the three clients injured were receiving treatment in hospital.
"It is our understanding that their injuries are not life-threatening," Turner said.
"Senior company representatives have travelled to Indonesia and are supporting those in hospital to ensure they are receiving the best possible treatment.
"They are also providing support to the other clients on the tour."
Injured woman Abbey Moore was in hospital in Lombok with a dislocated shoulder, a broken wrist and collarbone and suspected broken ribs.
Her mother Rose McConchie told the Herald she spoke to her daughter over the phone yesterday was relieved she wasn't more seriously injured or killed.
"It seems like she was very lucky to have escaped with the injuries she has," her mother said.