Dolly was published in a mass market sized paperback around the time the show was playing. The edition is a collector's item. I have a copy but it isn't leaving my house. I don't recall any other edition of the script.
Tams Witmark has copies of the script although having an audition for the show may not be enough to get you a perusal copy.
Best bet is to take a look at the source play, The Matchmaker by Thornton Wilder. There ought to be a copy in a decent library. I think the musical follows the structure of the play closely enough. I know the film of The Matchmaker does.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher