Around four years ago, B. Smith told her doctor about her symptoms before she told her husband and business partner of 22 years, Dan Gasby. Those problems, such as repeating things or not answering questions, became very serious.
Asked what her Alzheimer's diagnosis meant to her, B. said, "It meant something bad- really bad to me." More than five million Americans have Alzheimer's disease. There is no cure, and many patients suffer in silence.
Though symptoms have progressed, B. Smith continues to have the same positive outlook that helped make her famous. "I think the future's going to be fine," she said. "I'm going to do my best to make it work out for me, and for as many people that I can possibly help, too."
You can see more of Dr. Jon LaPook's interview with B. Smith on the June 15 edition of "Sunday Morning." [read more on CBS News.]