It seems to be some sort of message. And she's in a gown... A death of someone?
You could be very well right on that and make note of the color of the gown. It's white, the same color used for wedding dresses, the fact that she has a ring on her finger and the fact that she is holding a letter of some sort and the title of the image, which could mean she could be grieving for a lost fiance or, alternatively, he (or she) could have dumped her and had gotten a letter notifying her of his (or her, this is fanon after all) death or the ending of their engagement on their wedding day and she is remembering it on what would have been their wedding anniversary. I'm leaning towards the former.