As if Roberta's life wasn't mysterious enough! Some of her magazine appearances are wildly misdated. For example, here she is as "Joy" in Rogue, which was a serious competitor at the time to Playboy. But if its 1961 date is correct, then Roberta was only age seven!
Needless to say, there's an error here. (Her earliest magazine appearance is 1973, at age 18.)