This wonderful, gentle creature is Little Edie Bouvier Beale. According to a biography, she and her mother were abandoned by her father, and had to rely on their family (the Bouviers) for financial support afterwards. In the documentary "Grey Gardens", she and her mother are charming and talented women who live eccentrically and reclusively with many cats and raccoons in a falling-down mansion in East Hampton. Apparently they could not pursue careers in the entertainment business because their family was "old money" and disapproved.
Edie's creative outfits are almost as important as her wonderful dancing and singing. In the follow-up documentary, "Beales of Grey Gardens" she does more of it. These movies are well worth seeing, if only for the bizarre scenes of Edie feeding raccoons in an upstairs room.