The Little Rowdy (1919)

Betty Hall, sent to boarding school by her wealthy parents, leads her friends in pajama pranks which upset Miss Elliott, the matron. After breaking up Miss Elliott's first and only love affair, Betty is expelled. To save the family from further disgrace, Betty's father tries to get her to marry a man in his office, Franklyn Winters, but Betty refuses, saying that she will choose her own husband. Although Franklyn is made a partner in the business, his persistent courtship attempts are met by Betty's playful pranks. When celebrated novelist Roy Harper carries Betty to his home after she has fallen from her horse, Franklyn pursues them, and thinking Harper lured her in, fights him. Betty furiously upbraids Franklyn, but after he leaves, Harper's advances cause her to chase after Franklyn. At the last minute, Betty boards the train taking Franklyn to officer's training school. They are betrothed on its rear platform.