Personally, I do not find "A Rose for Emily" sad. It is a story of commentary, distanced from its characters and using those characters to demonstrate impersonal changes that have taken place in the community and culture of the modern South.
I wouldn't say this story is uplifting, naturally, but I also think it is too broad to be sad.
To me, a major theme of this story is the damage that can be done to people if they are isolated from normal human contact. Miss Emily has been isolated first by her father and then by her own feelings (I have a hard time deciding if she walls herself off because she feels superior to others or because she feels socially inept). By the end of the story, we see how much she has damaged her own psyche by doing this...
I'm not sure what you're asking us to discuss here, but from the tag line it appears as if you're looking for some help as you read and analyze this short story. I'm including a very helpful eNotes link which I'm sure you'll find helpful. You're right to think the story has a sad ending; in fact, I would even call it a tragic ending. Hope this helps!