John Paterson/Margaret McCrackan marriage 7th December 1845 Galston,Ayr.
One daughter,Margaret was born 1855,I would certainly open that on Scotlands People,those 1855 documents give a lot more info than later ones.
There is a possible marriage for this Margaret to Alexander Campbell in Dundonald,Ayr 1871.Could be her,she is certainly enumerated as a Campbell on the 1881 census.