The 47-year-old woman pleaded guilty to charges of being a party to sexual violation and being a party to attempted sexual violation.

An Auckland woman has pleaded guilty to selling her 14-year-old daughter for sex with a 70-year-old neighbour.

The 47-year-old woman pleaded guilty in the High Court at Auckland on Wednesday to charges of being a party to sexual violation and being a party to attempted sexual violation.

A police summary said the complainant was the woman's daughter and the offending began when the girl was nine.

The woman had "developed an arrangement" with a neighbour who would "have access to the complainant for the purposes of sexual gratification", police said.

Police said the offending took place between February 2008 and March 2014, from when the girl was nine years old to 14.

He would regularly come to the house on a Saturday, after the girl's father ​had left for the day.

He would pay the woman, ostensibly for the girl's school lunches, but the sums were "always destined to go to the defendant", police said.

"The defendant would allow (the man) to take the complainant into a bedroom at the address."

The man made the girl strip and when she protested he would tell her that her mother would giver her "a hiding" if she did not comply.

"The (mother) would threaten the complainant with physical violence and state "just do what he says or I will give you a hiding" and "just do what he says and I will be happy".

"The (mother) would subsequently remove her clothes, often with (the neighbour's) assistance."

The police summary described the man sexually violating the girl and attempting to violate her while the mother watched TV in the lounge.

"He would make encouraging comments to the complainant such as 'I'm proud of you'."

After the assaults, the man would then pay the mother a sum of money ranging between $10 and $30. ​

The offending finally stopped when the girl told a friend's mother she did not want to go home.

Police investigated and the mother admitted the man had been visiting since the girl was nine.

"She admitted she would allow the complainant to go into the bedroom with [him]. She also admitted to receiving money from [the man].

"She offered no explanation for her actions except to say she was remorseful and sorry."

The woman pleaded guilty and was remanded on bail to sentencing on September 25.

Justice Simon Moore said though she had been granted bail in the meantime, she should not misunderstand that a sentence of jail would likely be imposed.​