ELKHART - Carol A. Williams, 50, of New York Avenue, died Tuesday in Elkhart General Hospital of natural causes. Survivors include her husband, Bernard ''Buddy''; a stepdaughter, Sherri Williams of Elkhart; three stepsons, Carlos of Harrisburg, Pa., and Bernard and Brian, both of South Bend; her mother, Vellma ''Skip'' McCuiston of Osceola; a sister, Linda Morphew of Mishawaka; and a brother, Leonard McCuiston of Osceola. Services will be at 10 a.m. Friday in Hahn Funeral Home, Mishawaka, where friends may call from 3 to 7 p.m. Thursday