"Big flames started rearing up in the trees and we knew something was wrong. It got bigger and bigger."
Ms Allen and her sons went to their neighbour's house to investigate. She said it was apparent her neighbour wasn't home and the fire was getting out of control.
"There were flames engulfing this tree by the house. No one was there and the fire was out of hand - it was quite scary to be honest."
Ms Allen and her sons used buckets to transport water from a swimming pool on the property in an attempt to damp down the area between the house and the blaze. They also tried using a hose.
"It was no use. I said to the boys, 'get out of there'."
Ms Allen called the Fire Service, which was quickly on the scene.
"It took the [fire] brigade 10 minutes to get here, but it felt a lifetime."
Napier Fire Brigade senior station officer Mark McGill said it was fortunate the Allen family noticed the fire.
"When we got there, it [the fire] was just impinging on some firewood by the house."
Up to 1.2ha of scrub was alight and it took three fire crews about an hour to extinguish the fire.
"It if had been longer it might have been a lot worse . . . It's lucky they [the Allen family] spotted it."
Mr McGill said the cause of the fire had not yet been identified and it was still under investigation.