Looking for Ludy Lavern. DOB 4/25/1941 no last name. most websites asking for last name but don't know?

This is for Judy Lavern. She got adopted by Dr.Black but before she had family name of Jackson. I think she was 4-5 years old when adoption happened. I'm not sure what look like her last name now bcs. of marriage or etc. Her brother looking from Knoxville, TN. but he is afraid in case of find if she be willing to talk to him. he is 4 years yonger then her. Pls, help us to find her. you can e-mail me at beck_norm@yahoo.com if you find anything about