I wish I could be of more help, but I know how you feel. I jokingly call Pennsylvania the black hole of genealogy. As each family I trace into Pennsylvania, seems to get pulled out of existence and is never heard from again.
But I was doing some idle thinking. Sara named her first child Jefferson William. With William being the name of her husbands father. I couldn't help but wonder if Jefferson is also a family name, perhaps on her side.
I did a bit of looking and searched for girls named sarah born in 1852, living with a household with someone named Jefferson in it, in Pennsylvania in the 1860 census.
There's only 3. In each case the Jefferson is a brother.
Sarah Moore - Walker Township, Huntington County,
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX59-ZC3 : 30 December 2015), Sarah Moore in entry for Samuel Moore, 1860.
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Sarah Gleason - Jackson Township, Venago County,
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXRN-NJJ : 30 December 2015), Sarah Gleason in entry for Henry Gleason, 1860.
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Sarah Nelson - Peebles Township, Allegheny County. There's also a younger sister named Rebecca as well in this one.
Citing this Record
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXP3-ZYS : 30 December 2015), Sarah Nelson in entry for John Nelson, 1860.
Granted I'm probably grasping at straws, but who knows,
Best of luck.
craig