Did find a record for Border Crossing from Canada to United States for a Mary Kenefick arriving in Niagara Falls, New York on 22nd July 1943. Nara Publication No M1480 Roll no 64, Have no way of knowing if this would be her. Do you have access to above record?
Do you have access to Social Security Death records. Would she be recorded under maiden name/mothers maiden name of HEALY. Regards