"It's truly a momentary inattention [that has had] catastrophic consequences."
Mr Blathwayt said Rose had pleaded guilty at the earliest opportunity and would always carry the burden of her friend's death.
Prosecuting sergeant Garry Wilson said Rose's carelessness had been at the lower end but, as the consequences were tragic, needed to be denounced.
He said the community had been through a tragic period of time, with many young people killed on Wairarapa roads.
Judge Barbara Morris said Rose had been a restricted driver, so should not have had any passengers, and that neither girl had been wearing a seatbelt.
She said Miss Moyes had been on life support for three days before her family made the decision to turn the machine off.
"I have read the victim impact statement, it makes for heart-rendering reading, this happy family, including five children, has been torn apart...nothing the court can do can restore that, no words can describe their loss."
She said Roses' inattention had caused "momentous loss" but she had suffered the ultimate sentence.
Judge Morris sentenced Rose to 100 hours community work, ordered her to complete a defensive driving course and disqualified her from driving for 10 months. Outside court, Roses' grandmother, Monica Rose, said she was "just glad it was all over for her" and that Rose could now move on with her life.
"Although of course it's never going to be over for her."