"A Ticket To Tomahawk", 1950, with Dan Dailey, Anne Baxter, Rory Calhoun and Walter Brennan. A western comedy musical in which she gets to do a musical bit with three other ladies and Dan Dailey as they sing and hoof around to the tune "Oh,   What a Forward Young Man You Are!"        Westerns were very big in the 1950's and while not a big part for Marilyn it was more good exposure and another paycheck. She also appeared briefly (with no credit) in "Right Cross", 1950, with Dick Powell.  The prizefight movie was a box office flop.
Marilyn as belle in a Western Musical, but her outfit is the most proper- (wardrobe mistake?)