Tanith Lee is one of my favourites.  She writes both horror and fantasy, but her horror is very much that, frightening and demonic.  If you are into zombies, Rhiannon Frater is a good pick.  And I loved Cryptic by DA Chaney - May December Publications features a lot of female horror talent in their anthologies as well (Rebecca Snow, Suzanne Robb, Rebecca Lloyd are a few I can think of off the top of my head).  Carole Gill is another - she writes some pretty creepy stuff. I'd brag about my own work, but only my horror short stories have been published so far; my novels published to date have been fantasy and dystopian.  I have two completed horror novels I hope to see in print someday.

If you want a good sampler with many female contributors, consider Slices of Flesh from Dark Moon Books, a flash fiction horror compilation with work from 90 different authors.

And of course, the grandmother of all....Shirley Jackson. :)

Hey, I was going to add Caitlin R. Kiernan.

Early Kathe Koja, too. :)

Hello,

I've a list of female "horror" that does not include vampires (though many horror writers do tend to delve into that abyss). 

Chelsea Quinn Yarbro

Yvonne Navarro

Tanith Lee

Caitlin Kiernan

I have not read all of these women, but these are the names that come up.

Why are you needing inspiration? Are you trying to write a horror story?