Sorry that I hadn't noticed this comment before. This scene is from a chapter that actually still hasn't been written yet -- near the end of the story. I'm actually getting close to writing the scene (actually why I visited this page, haha), and to say what happens to cause this would be kind of a big spoiler. ^_^;
Suffice it to say, something unpleasant happens, and it's kind of like the final straw in a long string of bad events that occur for her character -- Aang ends up helping her get back on her feet, but in a more gradual way than what happened on the show.
Other art that is related to this: [link] And another that is being produced by lilacinum.
Well, it'd make for an entirely different series -- which is why it's been a pleasure to write the story this is a scene from, since it allows me to have a universe where I can explore questions like, "How would Korra and Aang interact with each other?" in a way that actually makes sense within the context.