What Katy Did (1872) by Sarah Chauncey Woolsey (aka Susan Coolidge) (1835-1905) is a classic children's novel based on a young 12 year tomboyish type of girl named Katy Carr who endures an accident by falling off a swing and becomes an invalid. Her cousin Helen also an invalid teaches Katy how to be a happier and kinder person by appreciating and making the most of what she has and how to be optim...