She was also banned from driving for six months and ordered to pay Mr Cullen's partner $2000 in emotional harm reparation.
Defence lawyer Claire Yardley said the fatal "misjudgment" that day would live with Enochsson for the rest of her life. She had twice met Mr Cullen's family, who were "very forgiving".
The court was told Enochsson moved to New Zealand in 2006 and was a stable foreman at a Canterbury horse stud, the court heard. She and her employers hoped she would become a resident of New Zealand.
She had offered to sell two standard bred horses to come up with the cash for the reparation.
Judge David Saunders said the case had been his most difficult of the week, because of the level of emotion.
He described Enochsson's level of culpability as low compared to most cases he saw, and described her as a hard-working woman who was well thought of by her employers.
He suggested to the probation service that her community work should be done for the Riding for the Disabled group in Christchurch.