I wondered if she had been completely abandoned. I read an MC story in which a slave is told to wait and then her Master never returns because he has had a heart attack or something whilst out. At least the slave there was free to move about, but was obviously uncertain what to do.

In this story if the woman has been left and her jailer is not returning, there are a number of options, maybe a cop who comes by when the neighbors say something, or a house breaker comes in and finds her like that. Maybe these are moving into too cliched porn settings. If you like bestiality, maybe even the pet dog finds her there.

Another interesting one is that whoever shackled her, I am assuming her husband, has in fact done it to give her over to a Master/Mistress who then arrives to collect her. Maybe the husband has been given someone else instead or has run off with his lover or thinks that going through this procedure avoids all the legal costs of a divorce.

It is up to you where you take it, but I do like little fragments like this as they are so stimulating for story ideas. Black granite is great as it is reflective, and I always find it sensuous that someone chained up can see themselves in that state and that usually happens through a mirror being placed somewhere, it adds to the humiliation and allows full descriptions of how they appear. I doubt we will see the rise of black granite fetish websites, but you never know