Board Thread:Off Topic/@comment-27082610-20170205050026/@comment-26397825-20170425063904

I found this on the Carmilla Wikipedia page:

According to Matthew Gibson, the Reverend Sabine Baring-Gould's The Book of Were-wolves (1863) and his account of Elizabeth Báthory, Coleridge's Christabel (Part 1, 1797 and Part 2, 1800), and Captain Basil Hall's Schloss Hainfeld; or a Winter in Lower Styria (London and Edinburgh, 1836) are other sources for Le Fanu's Carmilla. Hall's account provides much of the Styrian background and, in particular, a model for both Carmilla and Laura in the figure of Jane Anne Cranstoun, Countess Purgstall.

So nothing really concrete.