Young became one of Washington's top models and created her own agency in partnership with two other women. When she met the humor columnist
Art Buchwald, he suggested a co-partnership with his wife in writing a book about etiquette. Stewart collaborated with Ann Buchwald on two other joint books and then she started writing her own. She went on to teach etiquette and manners to children, including
Richard M. Nixon's daughters, and
Dwight D. Eisenhower's granddaughter and
President Johnson's son. Her husband started a business to teach etiquette training and Stewart began teaching classes for professionals and college students. After a car accident on June 30, 1997, Stewart was charged with a DUI. In 2018 her video
Table Manners for Kids: Tots to Teens was featured on the internet show
Best of the Worst hosted by
RedLetterMedia. It was voted as the best tape of the night. The panel members called her attempts to teach children table manners a "losing battle". Stewart died of
pneumonia at a
Kewanee, Illinois nursing home, at the age of 82. ==Published works==