In Search of Half Sister! DOB 3/2/1980

I am in search of my half sister. My mother gave birth to her on March 2, 1980 in Virginia. Her birth name was Marissa Spring Foy. She was adopted by Nancy and Sonny Harris who at the time were family friends. Shortly after the adoption, Nancy and Sonny cut contact with my mother and her family (or at least that is the way I understand it). I have posted this message before, but I am posting again just to be on the safe side. It is very important to me to find my sister, not only for my mother, who misses her and thinks of her often, but for myself.....:( If anyone can help me find my sister I would appreciate it......:confused: Thank you Tiffany