The character of Sylvia in the story "The White Heron" is one that is curious, observant, shy, and helpful.
Sylvia helps the old woman. She does this by taking over some more difficult jobs, such as finding Mistress Molly, etc.
This advances the plot because it is central to the theme which is women's liberation. The part where Sylvia helps the woman shows that women were subjected to hard labor.
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