Lainie was the "body double" for Barbara Eden in
I Dream of Jeannie (1965) episodes where Jeannie's "evil twin" sister was to appear with Jeannie in "over the shoulder" shots. So you never see her face. They would shoot all the shots of Barbara in the pink outfit and Lainie in green...then, they would change costumes and shoot the other angles. When both sisters's faces are onscreen, they shot split-screen scenes.