Speaking after the investiture ceremony, her voice trembling, she said: "It's very overwhelming. It's very humbling.
"You don't expect to be rewarded for something like this. It's been a life's work and I wouldn't change it for any circumstance in the world."
Dame Rosie's extensive philanthropic work has seen her chairing a number of groups and committees for various causes over the years.
She chairs the Friends of Starship, which helps the children's hospital in central Auckland, and has been vice-chairwoman of the Starship Foundation since 1991.
She is also a founding trustee and was chairwoman of the Breast Cancer Foundation from 1995 to 2005.
Yesterday, Dame Rosie said being in a position to help others - specifically children - was a privilege.
"It's been a lifelong dream to have a job that's fulfilled everything I've ever wanted to do - to help others and to meet people from all backgrounds.
"Every project has meant so much and just being able to do something for others who needed your help was wonderful.
"It's kept me from doing housework, too," she smiled.
Dame Rosie said she hoped her grandchildren would continue her work.
"I hope they learn from my example. I hope that they're always kind and considerate to people.
"And I hope they find it just as fulfilling as I have."
