More info on the play:

Credits and Cast: http://www.ibdb.com/production.asp?ID=11590

Time Mag review Nov. 7, 1938 http://www.time.com/time/magazine/article/0,9171,788885,00.html

" The Girl from Wyoming (by J. van Ostend van Antwerp; produced by John & Jerrold Krimsky) is the creaking American Music Hall's annual horselaugh, garnished with beer & pretzels. The tale of "a Harvard graduate trapped by sex in the purple sage," The Girl from Wyoming provides an uncannily false picture of the West in the days of Diamond Dick saloons, half-breed beauties with roses between their teeth, and the Pony Express.

The essential thing about the production is the beer: after the fourth or fifth schooner the audience roundly cheers the Harvard man for refusing to touch liquor, just as roundly cheers the Girl from Wyoming (June Walker) for having been weaned on it, loudly hisses a villain who looks like a referee at a snake race"

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There is also a magazine story by the same name from 1931 which could be related:
de SILVA, PAULINE (chron.)

* * The Girl from Wyoming, (ss) Love Story Magazine Feb 7 1931
see: http://users.ev1.net/%5C~homeville/fictionmag/s471.htm

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There is also a woman by the name of Alberta Claire, a.k.a. "The Girl From Wyoming" who rode horseback all over the states and appears to be a bit of a wild lady. An 1915 example of her writings, which includes problems with drunk cowboys is here:
http://www.thelongridersguild.com/alberta.htm

Could she be the cause of this?