The Biggest Show on Earth (1918)

Roxie Kemp works as a lion tamer in a circus managed by her father. To fulfill a promise to his dying wife, Nat Kemp sends his daughter to an upper-crust boarding school where she befriends Marjorie Trent. When Roxie visits Marjorie's aristocratic family, she and Marjorie's brother Owen fall in love, though Mrs. Trent, suspicious of Roxie's background, is cold to her. When Kemp's circus comes to town, Roxie prevents the audience from rioting by filling in for the superstitious lion tamer, who refuses to go on. Mrs. Trent recognizes and rejects Roxie until Mr. Trent reveals that he is part-owner of the circus, whereupon Mrs. Trent accepts Roxie into the family.