A Wrinkle...was the first book of any length that I read as a kid. Had to be 1963. I think it was also the first time that I read under the covers with a flashlight.
Red Planet, Heinlein was my first, but “Wrinkle” not long after. Yes, a flashlight book. Never understood that, it was my parents’ fault for teaching me to read before the schools could bore me to tears with “See Dick run”.
Sad to hear of her passing, but a lasting mark was made, is still being made on literate youth.