I read this book in the 1980s. There were large pictures on every page. The art was reminiscent of Arthur Rackham or the 1980s movie "Flight of Dragons." The figures could be quite grotesque with pointy ears, grey skin, or warts. The main character is a young girl. At one point she has to cross a wide canyon or chasm on a very thin or invisible string. I believe there is an ogress, troll, or giant that she outwits. The layout of the book was landscape (not portrait) and the cover had a purple border. Any help you could provide finding this book would be greatly appreciated!