Annie Louisa Robinson Swynnerton ARA (February 26, 1844-October 24, 1933) was a British painter best known for her portrait and symbolist works.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Annie_Swynnerton

Miss Elizabeth Williamson on a Pony by Annie Louisa Swynnerton
1906 / Oil on canvas / 66 1/4″x51 3/5″ / Tate Britain, UK

Annie Louisa Swynnerton on Art UK:
https://artuk.org/discover/artworks/view_as/grid/search/keyword:annie-louisa-swynnerton

Further reading:
https://www.bbc.com/news/entertainment-arts-43243536
https://www.lrb.co.uk/the-paper/v40/n18/inigo-thomas/at-manchester-art-gallery
https://artuk.org/discover/stories/annie-swynnerton-artist-and-activist