It's well known that Olivia fought hard for the role of Melanie. She had wanted to play Melanie from the moment she was introduced to the book, but she was under contract to Warner Bros. at the time, and in those days, an actor or actress had to have permission from the studio boss to work for another studio, and Jack Warner repeatedly refused to let Olivia even audition for the part of Melanie (although she had already read for the part behind his back because the producers of Gone with the Wind wanted her for the part), until she went over Jack's head and appealed to his wife for help.
And yes, it's truly the end of an era. But 104 is a DAMN good run, and for her to retain her sharp wit, her keen sense of humor, and her no-nonsense personality right to the end? We should ALL be so lucky. RIP, Olivia!