 On International Women's day in 2012 she was one of thirteen women to be featured in an exhibition called "Inspirational Botanists – Women of Wales" at the National Botanic Garden of Wales; an exhibition celebrating the contribution of women to the field of Botanical Science in Wales for the past 200 years.During her lifetime Gillham reached thousands of people during her lectures, guided walks and study tours, with whom she shared her wealth of botanical knowledge and interest in our natural heritage.After her death she left behind a huge expanse of scientific data, including species lists and notes on conservation/land-use change, all hand written on paper.