Who is Lady from The Wind Done Gone and what is their importance?

Lady is Planter's wife. Lady is a young, southern woman when Planter meets her who has just lost the love of her life. Lady marries Planter because she feels she has little choice. They make a good life together and have three beautiful children. However, they also lose three sons, sons that Cynara later learns her mother killed either because they were male, heirs to the farm, or because they demonstrated the black ancestry of their mother.