An historical novel (1795, signed E. M. F.)[2] takes place in the 15th century, presented in what a modern critic has called "an incongruous style".
[1] The plot involves an illegitimate boy who is advised to reclaim his unhappy mother, but who finds it hard to lay down his arms after the Battle of Bosworth Field, which ended the Wars of the Roses.
[1][3] Foster's writing gained confidence as she turned to more modern subject-matter in Frederic and Caroline, or the Fitzmorris Family (1800, E. M. F.),[2] which she dedicated to the Princess Charlotte Augusta of Wales.
"[2] Foster's conservative social views appear particularly in The Corinna of England, and a Heroine in the Shade (1809),[4] in which retribution is wreaked on a shallowly portrayed version of the French author Germaine de Staël's heroine of that name.
[6][1] Foster's work largely endorses mainstream Christian morals, often taking an ironic approach through a narrator, who identifies as a woman with a proto-feminist outlook.