She is a former health worker and chief executive of Maori development organisation Nga Tai O te Awa.
Mr McKelvie said it was a "very impressive facility".
"It's got an environment about it," he said. "I guess it's like living in a community."
The four MPs went to the prison, the central police station, the Maori Land Court and Life To The Max Trust.
At the police station they received briefings on trials around police safety orders and domestic violence, screening for alcohol and drug use, and alternative action for police to the court systems.
Police recognised alcohol and drug use was a driver of crime, Mr Borrows said.
They were also intervening "a lot earlier" and looking for "more lasting solutions than just putting people before the court".
"There was a 43 per cent drop in youth reoffending, having been dealt with by alternatives to going to court."
Mr Borrows said funding for Restorative Justice services was also being doubled after last year's budget, and to all NZ courts.
Mrs Dean discussed the safety order briefing, and said police could order someone to leave their house for five days as a "cool off period" if there was a domestic argument but nothing criminal had happened.
"The person who's removed isn't arrested or charged," she said. Police could also refer victims to agencies such as Women's Refuge.
Mr Borrows acknowledged it was an infringement of rights to remove a person without charging them, but said it was protecting more victims from potential harm.
Mr McKelvie said the safety orders seemed to be working well.