Judge Thomas Ingram revealed Heta had 11 previous convictions for drink driving or driving while impaired, and seven for driving while disqualified.
Unless Heta seriously addressed her alcohol addiction she would continue to be an "ongoing danger to the public", the judge said.
Judge Ingram said just over two years' prison was better to ensure Heta got help she desperately needed and desired.
Judge Ingram said Heta would have to show the Parole Board she was genuinely motivated to turn her life around and urged her to talk to her sentence planner.
Heta was also disqualified from driving for 18 months.