I love your Winky -- she's very much in-character, but you've also given her a perceptiveness and a depth that we don't see much of in canon. Her thoughts on the family she serves and the glimpses of Elf life are fascinating, and so are the relationships we get to witness, especially the friendship between Minerva and Barty Sr.
"Natural" was elflings coming with four toes instead of six. "Natural" was putting babies with four toes to the teat and loving them just like babies with six. "Natural" was elflings getting sick with the blue-shite disease and dying in their mothers’ arms, and "natural" was mothers and fathers wailing when it happened. As far as Winky could see, "natural" was just a way of saying things happen, and sometimes they’s good, and sometimes they’s bad, and we leaves it to each one to figure out which is which.