Emily is a sad character. She's been "neglected" by her father. She's been the subject of gossip by the people of the town and from the looks of it, she was going to lose another person in her life in Homer Baron. I think the title comes from an homage to Emily Grierson by Faulkner. The title, in a way, allows us to feel bad for Emily and not be entirely creeped out and dejected by the fact that she's been sleeping with a skeleton for years. It's as if as Faulkner was writing the story, he was thinking that he had to ensure there was sympathy for Emily and that sympathy would be an overriding factor, not just an afterthought.