Mary Riddle Tannehill
Birth: 1795
Maryland, USA
Death: Nov. 16, 1883
Mifflin County
Pennsylvania, USA
After the death of her husband, Robert Buchanan, she married Joseph Rothrock. Requested in her will to be buried next to James Buchanan her grandson.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=34842325