Child wants to see/have relashionship with real father but Can't?

I really don't know what to say except I'm sorry about the situation. There aren't really words you can tell her that she can understand just yet. Perhaps just tell her flat out, "You can't see him for your own good. I'm trying to protect you." but make sure you tell her when she's not upset. Tell her when she's calm, cool, and collected. Good luck.