No offense but your wife says things that make others worry so it's perfectly normal for the people that care about your wife to be worried and offer support especially when they know she grew up in an abusive house hold.
You should take it as a compliment that there are people here that want to make sure the person you love is okay. If You keep reacting like this to people who show genuine concern it will just further their belief that there is something wrong. You don't have to explain the situation but it would probably help to do it in a way that isn't hurt reaction.