There are any number of reasons to write a ghost story. I wrote this one because I was interested in the problem of the "realistic" ghost.
Here in San Antonio, we have scads of haunted buildings. The office building I worked in for 11 years had at least two ghosts, one on the floor where I worked, and we assume that our own house, built early last century, is haunted by something, probably a fairy of some kind. (Not that I've ever seen one, or expect to.) I also read a great many true ghost stories. This does not mean that I believe in ghosts, only that I am interested in them. It is not important to me whether they really exist or not. Assume, for the sake of the story, that they do. In that case - what's it like to be a ghost? Modern ghost theory is that ghosts are either mindless "recordings" (boring!) or confused souls who don't know they're dead and have to be encouraged to move "into the light." So how on earth, after ten, or fifteen, or fifty years can someone not know she's dead?
That's what half of the story is about. The other half is about how you deal with such a ghost if it exists in your house and impinges on your life. How do you cope with the fact that an unhappy person is trapped in your house, someone you can't see or talk with in the normal way? Is it possible - is it even desirable? - to be a friend to such a person?
I wrote this story to explore these questions. I still don't know the answers. But I don't really think that's the important thing. The important thing is always the story, never the moral.
Read about my other books.