PeachyPearl I can't say much about it since I don't know what it's supposed to be about.
It might be nice to add more focus on the main character in her times of sorrow though. I barely saw much about it. One second she was sad, next she was fine. I know you described how her behavior changed from the observations of others but that's barely covering the surface of what she's going through. Adding more descriptive narratives may also help since these people can't read her mind. Like ummm... when a person's sad... does he/she stare off into space? Does he/she doodle scribbles on a notebook? When spoken to, does he/she answer in three words or less? Is his/her voice softer?
Hope this helps! If you don't feel like it anymore, it's okay to drop a story. If you think it only needs a bit of tinkering then, work on that. Since the story isn't solid yet, try to write an outline so you can assess if you want to keep it or not.