What metaphors are used in The Summer of the Swans by Betsy Byars?

In Chapter 22, the swans flying overhead, which are now heavy and awkward where they were graceful in the water, serve as a metaphor for Sara. Sara wanted to be like the swans, to move to a new place and to be beautiful and graceful. Now Sara sees that, like the swans, going home is not such a bad thing and that even swans can be awkward and unattractive sometimes.