Lilyan Chauvin Lilyan Chauvin was the Emmy Award - nominated French actress , writer , and director who played Vedek Yassim in the episode . Biography . Chauvin was a native of Paris , France , where she began her career in show business working in broadcast radio . She was initially desired to become a lawyer , but soon shifted to acting . She moved to New York on her 21st birthday in 1946 and became an US citizen . She began appearing in New York television productions and ultimately moved to Los Angeles , California , to continue her career . Her acting career spans nearly six decades , with over 120 film and television appearances . In addition to acting , Chauvin was also a writer and director . She directed several stage productions in Los Angeles , including " Last Summer at Bluefish Cove " , " The Happy Time " , and " Laughter and Love " . In total , she has 34 directing credits as a member of the Directors Guild of America . She was also an acting and directing coach and was the creator , show - runner , and host of the instructional series " Hollywood Structured " . Additionally , she was a member of Women in Film for 39 years , which included two stints as the organization ' s Vice President . Chauvin died at her home in Studio City , Los Angeles , California , following a 40 - year battle with breast cancer . Congestive heart failure also contributed to her death . Film work . Chauvin ' s early films include the 1957 musical comedy " Silk Stockings " , ' s " Les Girls " ( 1957 ) , the picture " King Creole " , the 1959 thriller " The Wreck of Mary Deare " , and the 1960 western " North to Alaska " . She was uncredited in all of these films ; the latter co - starred Stanley Adams . Her first credited film role came in the 1958 drama " Lost , Lonely and Vicious " . She later appeared in such films as " Yours , Mine and Ours " ( 1968 ) , " The Mephisto Waltz " ( 1971 , starring William Windom ) , and " Funny Lady " ( 1975 , starring Ben Vereen ) . Perhaps Chauvin ' s best - remembered film work is her performance as Mother Superior in the 1984 horror film " Silent Night , Deadly Night " ( also starring Charles Dierkop ) . She is also noted for her roles in such films as 1980 ' s " Private Benjamin " ( with Richard Herd , Alan Oppenheimer , and Keone Young ) , 1990 ' s " Predator 2 " ( featuring Kevin Peter Hall in the title role ) , 1992 ' s " Universal Soldier " ( with Tommy " Tiny " Lister , Jr . , Ed O ' Ross , and Leon Rippy ) , 1994 ' s " Pumpkinhead II : Blood Wings " ( starring Andrew Robinson ) , 2001 ' s " The Man Who Wasn ' t There " ( with Christopher McDonald and Rick Scarry ) , and 2002 ' s " Catch Me If You Can " ( co - starring Robert Curtis Brown , Thomas Kopache , J . Patrick McCormack , Ray Proscia , and Jimmie F . Skaggs ) . Her additional film credits include " Listen to Me " ( 1989 , with Anthony Zerbe ) , " Bad Influence " ( 1990 , with John de Lancie ) , " True Identity " ( 1991 , starring Frank Langella and Michael McKean ) , and " No Place to Hide " ( 1993 , with Dey Young ) . Television work . Chauvin has guest - starred on numerous television series in the course of her career . In 1965 , she co - starred with Glenn Corbett and Irene Tsu in an episode of " The Man from U . N . C . L . E . " Two years later , she was cast by veteran director Marc Daniels in an episode of " Mission : Impossible " with fellow DS9 guest star Fritz Weaver . She later worked on another production with Weaver , the 1976 film " Marathon Man " , which also starred Marc Lawrence . Chauvin received an Emmy Award nomination for her guest appearance on a 1977 episode of the NBC adventure drama series " Baa Baa Black Sheep " , which starred John Larroquette . In 1979 , Chauvin appeared on Ricardo Montalban ' s popular series , " Fantasy Island " , in an episode with Ellen Geer , and in 1982 , she worked with Roger C . Carmel in an episode of " Diff ' rent Strokes " . In 1983 and 1984 , Chauvin played the recurring role of Sister Jeannette on the primetime soap opera " Falcon Crest " , working alongside Robert Foxworth and , in one episode , Harry Basch and Ted Sorel . Kate Vernon also appeared in one of Chauvin ' s episodes . She was later nominated by the Daytime Emmy Awards once again for her performance in a 1990 episode of the CBS soap opera " The Young and the Restless " . In addition to " Deep Space Nine " , other genre series on which Chauvin has appeared include " Earth 2 " ( starring Clancy Brown ) and " " ( in an episode directed by Mike Vejar and co - starring Kay E . Kuter ) , and J . J . Abrams ' " Alias " ( with Castulo Guerra ) . Among the many other television shows on which Chauvin has guest - starred are " Adventures of Superman " , " Maverick " , " Perry Mason " , " Daniel Boone " ( with George D . Wallace ) , " Mannix " ( with Paul Carr ) , " The Bob Newhart Show " ( with Ron Glass ) , " Magnum , P . I . " , " The Facts of Life " , " Baywatch " ( directed by Monte Markham ) , and " Murder , She Wrote " ( with Theodore Bikel , Richard Lynch , and Albie Selznick ) . More recent guest spots include episodes of " Friends " , " Frasier " ( starring Kelsey Grammer ) , " ER " , and " CSI : Crime Scene Investigation " ( with Wallace Langham , Matt Malloy , and Becky Wahlstrom ) . She made her last television appearance in a 2007 episode of " Ugly Betty " , the hit comedy series starring Alan Dale , Tony Plana , and Vanessa Williams .