Etimology: 'Goody Two-Shoes'

There are those words or phrases whose roots are obviously in foreign languages, ancient or not, and that's interesting enough. And then there are those that come to us along a slightly less circuitous, if not less fascinating, path. Take "goody two-shoes," for example. If you had to guess, where would you say that phrase came from? Would you have thought about a little one-shoed girl named Margery Meanwell, the heroine of a nursery story from around 1765? Clearly, its original positive connotation has morphed a bit over the years: http://mentalfloss.com/article/68494/where-did-phrase-goody-two-shoes-come