Except for one, all of them!
Hounds, generally speaking, are an independent breed. Bred to hunt and think on their own, they are not typically soft and fuzzy.Of course there are exceptions, but as I said only one of my six was obviously affectionate and sought out affection.
Also keep in mind, your girl is not used to being by herself. Her entire life, she was surrounded by other hounds (assuming she is a retired racer?). Her whole world has been turned upside down. It takes time for greyhounds to adjust to a home environment. Some longer than others. Sounds like you are doing just fine letting her be and come around on her own.