The book is a children’s picture book about a little girl in witch school, or living with witches. But she is not a witch, or she doesn’t look like one, but she is pretending. Every day she puts on her robe and hat, and also a fake witch’s nose to hide her small nose. The book had line drawing illustrations (black and white), and at least one involved spiders and her bed. The girl was swept away by a real witch on Halloween, having been mistaken for a real witch girl, and finds herself at this school quite by mistake. I’m afraid this is quite a stumper, as I have only the fuzziest recollections of the book, but would know the illustrations instantly. I have looked and looked, and can’t find it!