Technically, Ellen Datlow is more well-known for editing than for writing, but I thought it was worth including her, since I've read several of the anthologies she's edited. You can find her Wikipedia page here.
A.M. Dellamonica has written over thirty short stories, but I'm more familiar with her novels such as Indigo Springs (which I really enjoyed) and Blue Magic. Here are links to her website, Wikipedia entry, and Amazon page.
I know Doranna Durgin from her fantasy work such as Changespell and Dun Lady's Jess, but she also writes romance and mystery as well. I think she may be a hybrid author and is self-publishing her backlist, but I'm not certain. Here are links to her website, Wikipedia entry, and Amazon page.
Please feel free to add more woman SF/fantasy authors in the "D" category in the comments.