Hey hi, I'm Zeusy.
No covens right now are dedicated directly to Hekate. And I don't mean to sound rude at all, but Hekate is a Titaness :) The thought that She was a Goddess is more of a new age version.
If you'd like there's a page on the Theoi for Hekate. And if you'd like, you're welcome to ask me questions.