There are 2 titles associated with this person.

West, Jane, Anna M. Porter, Amelia Opie, Lady T. Lewis, Mary R. Mitford, Mrs. Marley, Letitia E. Landon, Laetitia-Matilda Hawkins, Anne Grant, Charlotte S. M. C. Bury, Anne Bannerman, Mrs. A. Baillie, and Joanna Baillie. The Casket, a Miscellany, Consisting of Unpublished Poems. London: John Murray II [Albemarle], 1829.
Lewis, Lady T. Dacre: A Novel. Edited By the Countess of Morley. In Three Volumes. London: Longman, Rees, Orme, Brown, Green and Longman, 1834.