Smitty, you may want to try getting a very long lead so that you can get distance between yourself and the dog without losing complete control. Eventually you can get to the point where you are not holding the lead, and then maybe without it. Dogs are really good discriminators, and she may think that "come" is only applicable for dogs that are on leash. =) Also, she may enjoy a good game of chase. Be careful not to reward the behaviors you are trying to eliminate.