British novelist, poet, and playwright best-known now for The Recess; or, A Tale of Other Times (1783-85), a quasi-Gothic (or is it fully Gothic?) novel full of political and personal intrigue (involving among others Mary, Queen of Scots and Queen Elizabeth), subterranean imprisonment, female persecution, betrayal, and desire. Sounds fully Gothic to me.... and let's not overlook its influence on Ann Radcliffe and Sir Walter Scott. (Interesting side note here: Sophia Lee and her sisters ran a highly regarded school in Bath, one which, some scholars have speculated, the young Ann Radcliffe may have attended, although Radcliffe's most authoritative biographer, Rictor Norton, discounts that as highly unlikely.)
This site includes a biographical note (actually an 1824 obituary that discusses her father more than Lee herself), a biographical sketch from 1797, another brief obituary from Blackwood's, and a number of reviews of her works The Canterbury Tales and Life of a Lover. [Corvey Women Writers on the Web, Sheffield Hallam U]