Simonetta Stefanelli?
I watched the movie and I can't seem to find her at all! It says her character is called Cotbi, but who is she?
"You'll Believe A Man Can Fly!" - Superman: The Movie
If you watched the feature-length version, then her scenes were probably not in it.
You probably need to find a DVD of the full-length miniseries to be able to see her scenes.