Who is the protagonist in "A White Heron"?

In the short story "A White Heron" by Sarah Orne Jewett, a young girl named Sylvia lives with her grandmother in a house in the midst of the woods. One evening while Sylvia is leading the cow home along a forest path, she comes across a hunter who is searching for a rare white heron that he intends to shoot and stuff for his collection. He ends up staying with Sylvia and her grandmother, and he offers Sylvia money if she will lead him to the elusive bird. At first Sylvia agrees, thinking of the things that the money could buy, but after she climbs to the top of a tall pine tree and spots the heron, she realizes that she does not want the hunter to take its life, rejects the money, and refuses to tell the hunter where the bird is.

According to the Merriam-Webster Dictionary, a protagonist is "the principle character in a literary work (such as a drama or story)." By this definition, the protagonist of "A White Heron" is definitely Sylvia. The story is told mainly from her viewpoint, it begins and ends with her, and it is her decision at the end not to disclose the location of the heron that resolves the story and reveals its theme.