It's either Character vs society or character vs nature. It could be either, honestly. Character vs nature because she was burnt by a fire, but it could be vs. society because most of the story focuses on what other people view her as. I believe the answer that they're looking for, however, is character vs society.
Answer:
the overall mood.
The tone of a story is how the author shows the general attitude in the story. So if the story seems sad through the words, you can assume the rest of the story will be as well.
Think of it as a horror movie. Weird or scary things happen in the beginning, and that general tone/theme will continue throughout.