How is Vesper Holly described in the novel, The El Dorado Adventure?

Vesper Holly is described as having waist-length marmalade-colored hair and green eyes. She also has "the digestive talents of a goat and the mind of a chess master." Vesper, who is accomplished in art, music, science and mathematics, often uses "her own special mixture of cajolery, browbeating and willpower" to get her way, especially when dealing with Brinnie, her guardian. Because Vesper is an excellent judge of character and possesses a well-developed sense of social justice, she uses her intelligence to solve mysteries, outfoxing the wicked and championing the good.