Mrs Cameron, who has been involved with Mamaku School since her eldest daughter, Lily, started there a decade ago, said she was "totally stunned" to receive the prize.
"We've been here for 10 years and it's going to break my heart when my youngest daughter, Bella, leaves for high school at the end of the year," said Mrs Cameron.
"Mamaku's a fantastic place and it's been a pleasure helping at this school with these gorgeous kids."
The judges, the council's Julianne Wilkinson and Christine Hutchison, and Harcourts' Glenn Austin, said Mrs Cameron was chosen because she embodied the definition of a "good sort" - someone who consistently added value to the lives of the children and parents at Mamaku School.
"Leslie does everything from transporting kids on school trips and to camp, baking for fundraisers, supervising road patrols, to clean-ups and tree planting," said council community engagement and events lead, Ms Wilkinson.