"The car had amazingly made it all the way from Morrinsville," they wrote on their Facebook page.
The woman blew 917mcg. The legal limit is 250mcg.
A police sergeant told the Herald there was very good information provided from concerned members of the public.
"There had been a number of calls about her driving and there was evidence she had crashed the car at least once on the journey," he said.
Given the high reading, she was charged with driving with an excess breath alcohol level and neglect of the children.
"Big thumbs up to that member of the public for following and calling us and of course well done to team blue for getting her off the road before anything worse happened," the police Facebook post said.