Being from the Midwest, I've never heard of "Fun at One." But Miss Mary Ellen just found the forum, and sent me an email.
Here's what she said:
I just happened upon your site and saw some members asked about Fun at One. I was surprised and delighted to see your members recalling Fun at One which was an early children's TV program. I am the Miss Mary Ellen they asked about. I am very much alive and singing with the Verismo Opera company in Bergen County, New Jersey. My partner, Miss Eppie, lives not too far from me and we still see each other frequently as we are close friends.
I would be happy to join NABBW and will check how to go about it when I have some time. Mary Ellen Rohon