Okay, here's a thought. It's beginnng to sound like the person on People Finders may not be Rose, if the whole family is black, but suppose she married a black man? This was the 70s, and as a child from a southern state in the 70s, I remember how lots of people felt back then about mixed marriages. I personally don't have those feelings and I want to be clear about that, but many people back then did, and probably still do. That might explain why she never contacted her family. If her dad or any of the family had racist feelings then she knew she would be even more disowned for marrying a black man.