So, 6 years later, I am have got no further in finding out Sophia Linn's baptism.
I did find that the 1794 is not my Sophia Linn.
The 1819 marriage transcription does not indicate she was a minor, but looking the baptisms of the children of Nicholas and Sophia Linn, the one before where my Sophia would fit was Jun 1796 and the next was Jan 1802, so there is a biggish gap where she could fit.
There are now a number of ancestry trees that include the LINN family to which I think she belongs, and I have had my DNA tested, so I am going to try for a DNA match with a descendant of that family.
At least I will know whether my assumptions are more clever deduction or wishful thinking, if I can find a current family member who has also had their DNA tested.
Di
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