Juliet Marillier, whose books would you enjoy as well? I was thinking about this on and off throughout the day, which probably shows how much I loved Ms Marillier’s “Daughter of the Forest”.
Sharon Shinn is the obvious pick, because romantic fantasy is the perfect description for the books both of them write. However, I’m not entirely sure that this is accurate, because Ms Shinn writes more traditional fantasy, whereas Ms Marillier’s books tend to be based in the real world (err… please bear in mind I’ve only read “Daughter of the Forest” so far and have no idea what her other books are about).
So I’m more inclined towards suggesting Diana Gabaldon, because like Ms Marillier, her books are rooted in historical fact, and they have the same sweeping epic feel, with very strong characters and relationships.