[kiterunner]

Well, there is a marriage 31 Mar 1842 at Crailing between John Welsh and Helen Jaffray, but then on the 1851 census the only John Welsh in Crailing (who was also the only one there in 1841) is married to a Janet Clark with a daughter born 2 Nov 1849. There is a female Welsh who died at Crailing on the 7th Jan 1849 listed in the OPR deaths and burials on Scotland's People, but she doesn't seem to have a first name listed. (Or maybe I went wrong somewhere when going through the alphabet on the free search) If you buy some credits to view the John Welsh / Helen Jaffray marriage and / or the Welsh burial maybe you will get some more info, even if it's just to rule her out.