Try Broadclist, or Bradninch that is where they are in 1861
1881 census he is on his own, married so she must have been visiting somewhere, could have been missed off there later.
They were married by licence at Weston supermare in 1860
Her death reg Honiton, and my family have tremletts on the line at Ottery st Mary, so if she was not buried with him, night have been buried in that area. cant see why she would be buried in Plymtree. Will keep looking.