Noting Cherrington had completed a drug and alcohol addiction programme since her offending, Justice Whata gave credit for an early guilty plea, which helped reduce the sentence from its starting point of eight years and six months.
It was fortunate the weapon was a peeling knife, or the injuries would have been more serious, he said.
Justice Whata suppressed the victim's name and any information that might identify him.
The summary of facts said Cherrington and the victim were in a relationship for about 12 years and he has been separated from his wife for about three years.
On August 22, police attended a domestic verbal argument between the pair at their Green Island home, and the victim moved back to his mother's house to defuse the situation.
On August 27, the victim and his wife were walking in South Dunedin, when Cherrington drove past. She later called the victim, and told him she was going to come and get her key from him. She also told him she was going to kill him.
As he approached the car to hand over the key, Cherrington opened her passenger door, started swinging her arms in an attempt to punch him.
Cherrington stabbed him seven times in the back, and once in the neck. He threw Cherrington to the ground, restraining her by sitting on her chest, and pinning her arms to the ground with his knees.
The victim sustained a punctured right lung and stab wounds.