this person went missing in 1997....i would estimate well over a million women probably had c-sections over a time frame that is not very concrete....as new york/long island is one of the most populated areas in the world. the bristol thing may or may not be a good lead...but even that would be like finding a needle in a haystack. I understand your ideas...just saying that from experience, these things are not feasible.
In year 2000 New York, there were
5,750 African American women who had birth by Cesarean section not millions.
They can ask each hospital and each Obstetrician group to look into their medical records and look to see if child has had medical care best death year.