To be fair, if you want a more original annis why not go back to the source?
Black Annis
Imagine a blue-skinned troll girl, sequestered in a remote cave by the tribal shaman, a witch of great renown. It was foretold in dreams and omens that the child would one day lead her tribe in a mighty battle. For this she was protected.
Yet the girl harbored a terrible secret. WIth each wound, she regenerated. With each healing, the skin grew back in patches both leathery and black.
When the child reached breeding age, she found that with each passing monthly cycle came terrible fever. When each fever broke, she emerged less like her father and more like her birth mother, a woman she had never known.
Grown to womanhood twice as fast as her peers, Black Agnes was the keeper of secrets. For the span of three years, she protected the ways of her mentor, the witch Bogwort. The troll shaman had died from the venom of two-headed swamp snake, yet Agnes had preserved her body, drying the skin and stuffing the corpse with tinder and roots.
For three years, she had assumed the guise of Bogwort, always speaking from the shadows of her cave when others approached. For three years she had trained with others of her kind, the Hagborn. Now the time had come.
Upon the morrow, Black Agnes would lead the trollfolk into a mighty battle against the goblin-kind. It was a battle they were certain to lose, for Agnes had prepared the goblins for the trolls' arrival.
Black Agnes slept soundly, within the darkness of her cave, and smiled.