She resigned from Cabinet after the crash, having also tested at an infringement level on an alcohol breath test – a lower-level offence that attracts a fine.
As the MP for East Coast, she also chose not to seek re-election.
Labour leader Chris Hipkins at the time said the crash followed Allan’s struggles with mental health, which had left her in a state of “extreme emotional distress”.
She later said the refusal to accompany an officer was because she had requested to speak to a lawyer first but this was denied, and she was pleading not guilty to test a legal grey area in the courts.
In interviews with 1News and the NZ Herald published on Friday, Allan has opened up about the night of the crash.
She said she had been in an erratic state of mind.
She then drove to someone’s house after a few beers.
“I was seeking probably solace in just some people,” she told the Herald. “It was a pretty intense evening. You make a series of decisions – I made a series of decisions. You regret them for a lifetime.”