Who is this mysterious regency lady?

Attended a Jane Austen Society luncheon/lecture today about the Austen subject of the hour: the Byrne portrait, a miniature(though the images of it going around make it look more like a bigature!) that claims to be of Austen on the back, and its current owner has been hawking it as a recently noticed authentic drawing of her, when we only have two sketches by sister Cassandra, only one of which shows her face, though a number of people, including my mother, are rather skeptical.

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