I presume that Pewtown was meant to be Pughtown, which is now known as Gainesboro, Frederick County, Virginia. Lewis McQuaid married Susan Oates in 1828 in Frederick County. A family story is told that he left her (or disappeared). Susan went to Leesburg, Indiana in the 1840s. Her tombstone gives her birth year as 1801 and death on 1873. Susan did not remarry. She is buried in either Bates County, MO or in the County across the line in Kansas (I have a picture of her tombstone but failed to record the place of burial).