Are we talking about the same Carlotta Edwards? I have an oil painting called 'Scheherezade', based on the Arabian Nights stories.
The previous owner of the painting claimed that Carlotta Edwards was a young Russian woman brought by her Welsh husband Norman Edwards to England in World War I, and that she died in 1977.
She was supposed to have painted ballet scenes for Medici Galleries printing cards, so this seems to be more than a coincidence with your 'Carlotta Edwards ballet art'.
The painting itself is dated 1971, so I'm mystified by the claim that she was a 'British, 19th C' artist in http://www.artinfo.com/artists/profile/56188/carlotta-edwards/
Does anyone have more information?