One of the featured characters in the song "Froggy Went A Courtin'," she and her new husband Froggy show up in Elmo's room to offer him and Elmer some wedding cake. The pair stay to watch Johnny Cash, after which they find another wedding present, a blender.
Mousey declares that what they really wanted was a story about a furry blue monster who drives a train through the woods into the mountains and into a snowstorm. (Froggy says they should have registered.) Fortunately, Elmer fills the void with "The Ballad of Casey McPhee."