I first typed in just "Sylvia lwowski", and then "Sylvia Alice Lwowski", and, both times nothing-not sure what that indicates
My :twocents::
I think the last name is unusual enough that you could try that alone, if you haven't already. That way, if the story angle highlights another family member, such as the parents (e.g., "Parents Still Searching for Daughter After Almost 40 Years"), the last name could be introduced with their first names, and later say "their daughter sylvia" without a last name attached -- and your search would still turn it up. This search might also turn up other related/unrelated Lwowskis, which could be helpful.
When I first ran into this, one of my searches turned up three hits, IIRC, but I didn't have a subscription. Unfortunately, I can't remember exactly what I searched ... but probably just "Lwowski." Come to think of it, maybe also "Staten Island," since that would be unusual enough to find in a west PA paper.
One thought I had was that this west PA connection might also be an error. Not sure what the chances of that are. But in the
SSN death files, I found two J Lwowskis, both born in 1914, one (Joseph F) from NJ (ours, I thought -- b. 9/11/14, d 1/11/93) and one from PA (no middle initial, b. 5/10/14, d. 8/1983). Could the PA JL be unrelated or a distant relation? You would think that incorrect info would not be linked to one of the "missing" sites, but I remember that details about what she was wearing were incorrect on one of them.