I just wrote a post about Femdom in the Whedonverse and I completely forgot to mention Glory.
I also skipped Jasmine, but other than being a literal goddess she doesn’t fit the bill.
The big bad from season five, is a hell Goddess who clearly draws inspiration from the Dommely domme stereotype. She’s surrounded by gross scabby submissive minions that serve her every whim, they worship her often with titles such as “Her Splendiferousness,” “Her Sparkling Luminescence” and “Oh Sweaty-Naughty-Feelings-Causing One.” She lashes out violently and or verbally whenever she is displeased, only to have her minions thank her for their wounds.
All in all she seems to be exactly the Domme that whomever is in charge of Femdom porn is looking for.
Off screen here, she’s being served by blindfolded minions.