Here is a short list. (I have not included Jane Austin, the Bronte sisters, or Elizabeth Barrett Browning becasuse they are by far the best - and sometimes only - known English women writers from the era. Though it should be said that EBB is particularly interesting because she is arguably the first woman poet in English who has been given an historical status exclusively as a poet.)
-Baillie, Joanna (1762-1851)
-Barbauld, Anna Laetitia (1743-1825)
-Cook, Eliza (1818-1889)
-Edgeware, Maria (1767[8?]-1849)
-Eliot, George (1819-1880)
-Elizabeth, Charlotte (Tonna) (1790-1846)
-Ferrier, Susan Edmonstone (1782-1854)
-Gaskell, Elizabeth (1810-1865)
-Gore, Catherine Frances (1799-1861)
-Hamilton, Elizabeth (1756-1816)
-Hemans, Felicia (1793-1835)
-Hofland, Barbara (1770-1844)
-Howitt, Mary (1799-1888)
-Inchbald, Elizabeth (1753-1821)
-Jameson, Anna Brownell (1794-1860)
-Loudon, Jane (1807-1858)
-Martineau, Harriet (1802-1876)
-Mitford, Mary (1787-1854)
-Morgan, Lady (Syndey) (1776-1859)
-Oliphant, Margaret (1828-1897)
-Opie, Amelia (1769-1853)
-Owenson, Sydney [Lady Morgan] (1781?-1859)
-Proctor, Adelaide Anne (1825-1864)
-Rowson, Susanna (1762-1824)
-Scott, Mary (1751-1793)
-Seward, Anna (1747-1809)
-Taylor, Ann (1782-1886)
-Trimmer, Sarah (1741-1810)
-Trollope, Frances (1779-1863)
I would be interested in an honest confession from readers of which of these authors they have heard of or, better yet, read. The most famous names on the list are surely George Eliot and Elizabeth Gaskell. For me the most interesting names on this list these - Eliza Cook who published a journal for a number of years and advocated for a number of progressive causes. Jane Loudon who published a book called The Mummy which is, by many accounts, the first real science-fiction novel in English. And Maria Edgeworth whose short novel Castle Rackrent was groundbreaking in a number of ways including being one of the first stream of consciousness books, one of the first historical novel (it influence Sir Walter Scott in a significant way), and one of the first novels written from the point of view of an unreliable third-party character.
This is obviously not an exhaustive list but it is a good reflection of the women writers during the period. As I said, any thoughts on the list would be interesting.