What was the name of the character played by Katherine Hepburn in the film 'The African Queen'?

The African Queen is a 1951 British-American adventure film adapted from the 1935 novel of the same name by C. S. Forester. The film was directed by John Huston and produced by Sam Spiegel and John Woolf. The screenplay was adapted by James Agee, John Huston, John Collier and Peter Viertel. It was photographed in Technicolor by Jack Cardiff and had a music score by Allan Gray. The film stars Humphrey Bogart (who won the Academy Award for Best Actor – his only Oscar), and Katharine Hepburn with Robert Morley, Peter Bull, Walter Gotell, Richard Marner and Theodore Bikel.

Samuel Sayer (Robert Morley) and his sister Rose (Katharine Hepburn) are British Methodist missionaries in the village of Kungdu in German East Africa at the beginning of World War I in August/September 1914. Their mail and supplies are delivered by a small tramp steamer named the African Queen, helmed by the rough-and-ready Canadian boat captain Charlie Allnut (Humphrey Bogart), whose coarse behavior they tolerate in a rather stiff manner.