Richelle has previously mentioned The Mists of Avalon by Marion Zimmer Bradley as a favorite book of hers, and this is what she has to say about it:
I read this book when I was fourteen, and it opened my eyes in so many ways. It had never occurred to me then that you could take a great epic like the Arthurian legends and tell it via periphery characters—in this case, the women. This book also illuminates so many ideas about religion and spirituality that are as profound to me now as they were in my teens.
The interview is also about her Succubus and Dark Swan series, but there aren't any spoilers if you haven't read the books.
You can see more pictures and read more in Open Road's author profile about Richelle.