what is the central conflict in the poem "she walks in beauty"?

Byron wrote this poem about Mrs. Wilmot, his cousin Robert Wilmot’s wife. The beauty of Wilmot is found largely in its balance of opposites: the darkness she walks in (and her dark hair) counterpoise her fair skin and the bright pureness of her soul. In this lady, the “tender light” is “mellowed,” in contrast to the “gaudy day” which has only the glaring sun and no shade to soften its radiance. Thus the lady’s simple, inner perfection produces a beauty superior to nature itself.