Gwynn reached a large audience by remaining independent from organisations or those from a narrow academic expertise and became a national celebrity in Wales. She expanded her role to write about alternative medicine, nutrition, women's status in society and the dangers of nuclear power. Gwynn authored the space exploration book I'r Lleuad a thu hwnt ('To the Moon and Beyond') in 1964, a tip book for women in societal change called Cyfrol o gyngor a chyfarwyddyd ('Marriage. A volume of advice and guidance') in 1966 and a healthy eating book called Bwyta i Fyw ('Eating to Live') in 1987. She was the recipient of a BBC drama writing competition award for her work on a scientific field in 1970. Seven years later, a painting Gwynn produced was exhibited at the National Eisteddfod Art and Crafts exhibition; she preferred to paint in charcoal, oil and watercolour.