The Belle Starr Story (1968)
The Belle Starr Story/Il mio corpo per un poker is a 1968 Italian made episodic Bonnie and Clyde type spaghetti western co-written and co-directed by Lina Wertmüller and starring Elsa Martinelli who also sings the title song. It is the only spaghetti western directed by a woman and one of the few which stars a woman in the title role. Wertmüller replaced after a few days Piero Cristofani, who was at his directorial debut.
More at Wikipedia.