The book I am looking for must have been published before 1994 at the very latest, and I would think after 1975 although it could be earlier. It’s a children’s chapter book. The main character is a girl child with magic who is learning to be a witch: she lives in a cave with I think her grandmother/s and/or aunts who are old witches, and who are pretty grumpy and uncomfortable. She sneaks out one night and discovers a fairground nearby, and rides on the ferris wheel. (She might make a human friend, which isn’t allowed, and there might be a cat, but I’m not sure about those.) She decides to show her older female relatives that humans can have nice things, and I think she steals some of the ferris wheel cars and puts cushions and warming spells in them so her older female relatives will have nice warm places to sit? I think the cover was illustrated, but not super cartoon-y. I have googled and googled and found nothing.