It might be worthwhile looking at the Cambridgeshire FHS website as a tiny fraction of Royston is in Cambridgeshire, this seems to be a custom of ancient settlements along the Great North Road, Royston, Stamford, Bawtry, are (or were) all straddling county boundaries. But I digress, I have no detail of her, but there is a lady surnamed Kefford who lived in Cambridge Place Cambridge in the 19th century, and according to my late grandmother and mother was a relative, but I have not yet traced any connection.The family, Ayres/Cornwell lived in the Cambridge area and many were Baptists. The Baptist church kept their own marriage records, many of which have survived so it is worth checking further.