Looking for a book - not sure if it’s a novel or short story - about a young girl spending time, possibly during summer break, in the woods. She’s pre-teen or teen, and with the permission of her family is living either in a tent or a treehouse out in the country, perhaps right on her family’s property. I don’t remember much else except 1) her eating roasted grasshoppers, and 2) someone (her father?) dropping off books for her to read and her being annoyed because she didn’t want help. I read this in the late 70s/early 80s, but have no idea when it was published.