The girl had critical head injuries and was not breathing when a young woman from Tutukaka arrived moments later.
Mr Masters said the woman, who had grown up in the Australian outback with parents who were senior nurses, cleared the girl's airways and put her in the recovery position.
The child started breathing again and was airlifted to the intensive care unit of Auckland's Starship Hospital, where yesterday she was still in a critical condition.
Mrs Apiata said the girl and her twin brother lived in Kaitaia but had been visiting their father in Waitangi for the holidays.
It had since been an extremely difficult time for the family, who had been warned last Thursday to prepare themselves for the possibility that the child's life support would be turned off.
However, brain scans had shown a slight improvement since then, prompting Starship's doctors and nurses to persevere.
Her brother was uninjured but flown to Whangarei Hospital as a precaution. The driver, Mrs Apiata's son, suffered broken legs and ribs and a punctured lung. He was discharged from Whangarei Hospital on Monday.
Mrs Apiata said the families were also grateful for the support, love and prayers they had received from as far away as Australia, even from complete strangers.
"Without that we wouldn't be able to cope. It's just so uplifting."
The families were also hugely grateful to the St John medics, volunteer firefighters, police and helicopter crews.
Police are still investigating the cause of the crash. The driver of the ute, a Russell man in his 50s, was moderately injured.
* If you are the woman from Tutukaka who helped at this crash scene, or know who this "angel" is, please contact the Advocate on 09 470 2875.