...appeared on the CBS sitcom "Newhart" around 1988 and claimed to the Daryl brothers that after a thunderstorm she liked to go in the back yard and just roll in the mud? The brothers were fascinated. I'm not sure how I would even find the episode, but she was a guest star.

That was Emma Samms. I remember that episode. It's where everybody is having dreams. It was Larry's dream to host the Tonight Show. From imdb.com:

A Midseason's Night Dream, aired 14 March 1988, Season 6, Episode 21