Maiden, who is of European and Maori descent, said she said "ka kite ano" (see you later) to people standing outside the pub and was confronted by Opai who asked why a "palagi" would use such words.
The Howick mother of four told the Herald he then punched her several times - knocking out five teeth, cracking her top plate and leaving her unable to eat.
But just days after she went public with her allegations, police said CCTV footage of the incident told a different story.
"The version of events given by the 46-year-old female is not substantiated by this footage . . . a decision has been made to prosecute [her] and a 43-year-old male," a statement said.
A staffer at the bar said it showed Maiden slap and punch the man before he punched her back.
The court confirmed her matter had been called on Monday, when she pleaded guilty to attacking Opai.
A sentencing date in March has been set but Maiden told the Herald yesterday she had not pleaded guilty and the judge believed the stories were "twisted".
She said she was standing by her original version of events and would not comment further.
"I don't want to be in the media anymore. The news has embarrassed my children," she said.
Opai will be back before the court later this month.