Sheila, I would recommend that you begin your research by looking at Indiana
marriage records indexes at the FamilyTreeMaker Genealogy Library and on
Ancestry.com. Do a search on the name "McClary" to see if you can find a
McClary married to a Sophia. This should give you the maiden name that she
was using, as well as a county in which to search further. Also, it is
likely (but not certain) that since Sophia's father was a sailor, any family
that lived as far from the ocean as Floyd Co. is would most likely be close
relatives to her father or close family friends. I think that is the key to
your mystery.
Another place to look would be on the various websites that provide passenger
lists (ISTG, Cyndi's List, FirstMom's, and Olive Tree, etc.) Passenger
lists usually include information regarding deaths and births at sea. You
can begin your search on voyages that took place in 1851, which is probably
when Sophia was born.
Good luck in your search.
Jack Ott
Researching: OTT, HOPPER, SUMMERS, UTZ, BAKER in Floyd and Harrison Counties