You know this could be expanded into quit the story if you were interested. I found myself thinking up quite a few plots to this work after seeing it the first time. The fact that she is wearing a short dress and shirt underneath the jacket could of meant that she was simply in school before "it" occurred. The jacket could of been taken from an abandoned story she and her friends found exploring the desolate streets of a city frozen into the environment now that people are no longer around to keep the encroachment of nature. The ripped shirt could be indicative that she didn't have an easy journey getting to the city. Man, the amount of plots I can come up with for this are astounding! Hope to see more of this from you in the future!