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She was thrilled with the success of an open day last week, with about six people taking away volunteer packs.
SuperGrans volunteers offer practical advice to people facing difficulties with domestic life.
It has branches throughout New Zealand.
Volunteers work one-on-one, teaching life skills such as shopping for nutritious food and preparing basic meals.
Ms Tonner, who moved to Oamaru from Auckland in January, is a homeopath and life coach.
SuperGrans' motto of helping people to help themselves fitted in well with what she did, she said.
SuperGrans was an "amazing" initiative and she got a buzz out of helping others and lifting their self-confidence and self-esteem.
It was about making people more self-reliant, and teaching them basic homemaking and home management skills would give them the start they needed to make progress on their own, she said.