In the The Midnight People Novel:
In the Waking, Lady Ashley Grigori is the sister-in-law to Alexander Grigori. She has a long, aristocratic bloodline that plays in very nicely to her being the Witch Queen of a very secretive sect of Witches in England.
In the Dreaming she is Ashera(h), a Grigori or Demoness once worshiped as the Great Mother Goddess herself.
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The Midnight People
World Under Siege