Possible Clues:

• 'Oklahoma!' gal
• 'Oklahoma!' girl
• "Oklahoma!" fiancee
• ''Oklahoma!'' fiance
• Musical 'girl who cain't say no'
• 'Oklahoma!' character who sings 'I Cain't Say No'
• 'I Cain't Say No' singer
• ''I Cain't Say No'' singer
• "I Cain't Say No" singer
• She 'cain't say no'