Is there proof positive that she did it fact say that, or, is it just another urban legend?
The quote has been made up, presumably because it is considered more 'amusing' than the reality that she apparently commented on what a fine polo pony he was riding. Camilla herself denied the comment c.2005 when she was asked by the biographer and media commentator Gyles Brandreth - but he chose to ignore it, probably because nowadays journalists can't be bothered to do any research and prefer to put together a whole string of previous press cuttings as Jonathan Dimbleby discovered. Incidentally she also denied that she first met Prince Charles in 1970 at Windsor Great Park, which tends to suggest that my preferred date of meeting in May/June 1972 when the Prince was on a naval course only a few miles from Camilla's grandmother's house in Hampshire is probably nearer the mark.