Ardeth is Jay Sherman's ex-wife and the mother of their son, Marty. Her surname is unknown. She fell in love with Jay as his nurse, during a period in which he was completely bandaged and gagged. She instantly regretted marrying Jay, admitting so during the wedding ceremony. They spent their wedding night playing The Newlywed Game, which they won (Jay correctly guessed Ardeth compared his sex appeal to a dead mackerel).
Ardeth spends most of the series insulting Jay or demanding more alimony. At one point, when he greets her at a school athletic competition, she tells him he has to pay her $100 every time he talks to her. Handing her a wad of cash, he replies, "Fine. Here's two hundred. Get bent!" It is implied that Ardeth cheated on Jay with the judge who presided over their divorce case when, during the hearing, they make suggestive comments and flirtatious purring sounds to each other in front of Jay. She once attempted to place a voodoo hex on Jay's girlfriend Alice, despite the divorce settlement specifically forbidding such actions. Despite her dislike of Jay, she shares Jay's affection for their only son Marty and even goes so far as to admit, "We raised a great kid." She is often seen when Marty is in a show or event. She has a handsome blond rich new personal trainer and boyfriend named Alberto.
- In Franklin and Ellie Get Lost, it was revealed that during their honeymoon, Ardeth revealed to the inhabitants that Jay was a virgin and had planned to sacrifice him to the volcano, which backfired and caused the volcano to spit him out.