Just as psychological black magic is a major topic in this blog, so are witches, fictional or otherwise, unconscious or otherwise.
Carole Angier's biography Jean Rhys: Life and Work, which is generating a whole string of articles, contains material that suggests that Jean Rhys was witchlike in many ways. This material includes the devastating effect that she had on people close to her and her attitude, behaviour and experiences throughout her life.
It was interesting to learn that in later years she became completely bent over, like an old witch in a fairytale.
This picture makes her look rather sinister:
Jean Rhys said herself that her neighbours in Holt in Norfolk called her crazy and a witch, and that her neighbours in the Devon village of Cheriton Fitzpaine also called her a witch. She said that one of these neighbours was a witch herself, and that there was black magic in the village!
Carole Angier tells us that in later life Jean Rhys had dreadful moods in which she became sinister, witchlike and cruel. As mentioned in the article about Diana Wynne Jones's evil witch Aunt Maria, in one of these episodes Jean terrified her nurse/assistant by locking the door to prevent escape. Carole Angier uses an interesting expression when recounting this incident:
“Janet had 'never been so frightened', 'she'd never wanted to get out of anywhere more'. As though by black magic, Jean had transferred her own worst feelings of terror and entrapment to another person. She had made someone suffer like her.”