Bea Benaderet's last appearance(s)
In her last onscreen appearance, she has one quick scene where she rushes in to Steve and Betty Jo's home to check on Betty Joe, who is currently with Doc Stuart. Pretty quick scene, and for some reason she's holding a towel or something in front of her. Possibly to mask some weight loss? She still looked pretty good to me.
In the next episode, when Kathy Jo is born, she has a body double with her pre-recorded lines being dubbed in.
It would have been interesting to hear any of the actors' comments on her health condition during the last episodes she appeared in.