One of the first two women to graduate from the Indian Institute of Management- Ahmedabad (IIMA), Dilnavaz held management positions in Voltas and as Personnel Director of Grindwell Norton Ltd. In 1973 she decided to use her management skills for a social cause and became Chief Executive of World Wildlife Fund, India. She systematically spread public awareness on environmental conservation, was involved with Project Tiger, initiated WWF-I’s Nature Clubs and Products department. She was conferred a Knighthood in the Order of the Golden Ark by Prince Bernard, President of WWF International.
In 1976 she took up responsibilities in a family business, Bharat Tiles and revived its heritage tiles range. Dilnavaz continued her environmental work honorarily as Vice-President of the Bombay Natural History Society, Coordinator of the Save Silent Valley Committee, Bombay and on Government of India Committees. In 2003 she headed a committee on Ecological Foundations for Sustainable Agriculture in Maharashtra. The Sahayak Trust, founded and funded by her, initiated an Anaemia Free India Forum in 2016 and has trained (by Feb 2022) 287 partner NGOs, who have helped over 5000 schools and 38,000 households to develop Organic Kitchen Gardens for Nutrition.