Commenting on lines 112-19, Roland A. Duerksen points out that Shelley places emphasis on Emily's "adaptability and variety as well as upon the eternally reliable and responsible process of the love that is her energy and light" (56). It also important to think about the "shadow of some golden dream" (116) as being derived from Shelley's platonic idealism. But Shelley seems to be doing something interesting with his idealistic thought. The "adaptability and variety" that Duerksen points out gets across the idea that the dualisms of permanence and change are collapsible.
Dureksen, Roland A. Shelley's Poetry of Involvement. New York: St. Martin's P, 1988.