In 1908, the artist Walter Sickert was impressed by her talent and decided she should learn etching. She enrolled in Sickert's evening classes, first at the Westminster School of Art and then at a private art school he founded in the Hampstead Road. Gosse eventually took over responsibility for running this school, which became known as Rowlandson House (alternatively, the Sickert and Gosse School of Painting and Etching). She served as co-principal from 1910 until it closed in 1914 and taught some classes there as well. Gosse had an independent income, and without her financial support the school would have closed much sooner.