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Her Greatest Performance is a 1916 British silent crime film directed by Fred Paul and starring Edith Craig, Ellen Terry and Dennis Neilson-Terry. Gerald Lovelace (Dennis Neilson-Terry) is accused of a crime and wrongly arrested, his mother (Ellen Terry) gives 'her greatest performance' when providing him with an alibi. Joan Morgan plays his daughter. Presumably this is a lost film. imdb.com