I have a Margaret Lawson born 1813 Drumchorich, Drumkeeran. Lawson is an unusual surname in that area and after scouring the records locally, I believe she may be the Margaret who married William Noble on 13 December 1844 in Lack Parish Church, Colaghty. She would have been 31 which is quite old but so many women died in the Famine in the 1840's that she could have been a 2nd wife. I have been unable to find later records for her and so it is possible she went to Canada. Do you have any more information on the couple? Did they have children?
I also have a record for a Jane Noble and Samuel Patterson having a son Samuel born Sept 1865 in Ederny Fermanagh. My Lawson family are connected by marriage with the Pattersons.