Maurita Kelly Couch, 77, an artist and art teacher, died Tuesday at her Oak Lawn home. Mrs. Couch was a niece of the late Edward J. Kelly, mayor of Chicago from 1933 to 1947. Daughter of the late William A. and Florence. Wife of the late Henry. For more than 10 years, she headed the art faculty at the Academy of Our Lady and at Quigley South Preparatory Seminary. Mrs. Couch is survived by a son, Patrick; two daughters, Penny Cooper and Peggy Greene; and eight grandchildren.