Hi, Noticed this thread. I have Sarah Luffman in my family tree. She was born in Whiteparish (where there are generations of Luffmans going back to 1560's) to labourer Robert Luffman (1749-1833) and his wife Ann Phillips. They had children Robert 1773, John 1775, Sarah 1777 (who died same year), your Sarah 1778, William 1781 and James 1785, all baptised in Whiteparish. Soon afterwards, the family possibly moved to Broughton and eventually Robert and Ann settled in West Tytherley, where Ann was buried in 1837. Hence Sarah was in the vicinity to marry William Dowling in 1798.
Hope this helps!
Giselle