Sandy Duncan is an actress and singer who was very active on tv from the 1960s into the 1990s. I remember her many guest appearances on tv shows. She has pixie-like qualities in her appearance and voice mannerisms.
She also had her own tv show, "The Hogan Family", in the late 1980s. This show was a continuation of actress Valerie Harper's sitcom, "Valerie", which was discontinued after Harper had some kind of dispute with the producers. Ms. Duncan's character became the star of the show and it was renamed.
It was in the late 1980s I sent her this photo, and she signed and returned it within one month.