Son, searching for Mother's birth family.

I am looking for my mothers birth family. Her records were sealed however, Mom did get some basic information. She was born on or around April 24th 1946 in, so we were told, Natchez, MS. My grandparents were wealthy at the time, and it may have been a closed adoption do to the closeness of the family member. We do resemble our Grandmother strongly. The name we were given was Kittye Robinson. She named my mother Joyce at birth. The adoption was handled, privately, by MS Children's Home Society. While they did try to be helpful, they were unable to completely give out any information. We did get some non-identifying things, but only a few tidbits. If you can help, please email me.