The first car flipped on to its roof and had remained upside down in the garden ever since, and the second car now sat beside it.
"The first guy just got out and got someone to pick him up and the other two, police came and took them back to Henderson."
It was lucky the accidents happened during the night, she said.
"It's on a bank area where we garden, and right next to the garage where we would be [during the day]."
She had been contacted by the vehicle owners' insurance companies.
"The insurance companies and tow truck companies have contacted us, the first one might need a crane to lift it out which would require a road closure and cost about $4500.
"Hopefully the other one can just be towed out with a tow truck."
She said the house shared a perimeter with a tight bend that carried a 20km/h speed suggestion in a 50km/h zone.
"We need to get a barrier there."