Sketch For A Story Never To Be Written

I dreamed the basic elements of this one last night. The protagonist is an ordinary woman, probably a blue collar worker of some sort. She discovers that gradually, part by part, her body is transforming into a machine. This isn't being done to her by aliens or evil scientists or whatever; somehow, the process itself is organic. We go through the expected stages of horror and confusion, but eventually the transformation is complete. Those around her are aware that she is now a machine. I'm not sure if she looks different, or how they know. But they come to accept her, and she's a good worker and not hard to be around. As a machine her desires are not totally extinguished, however, otherwise she could not function. Rather, her former desires act like programs for the machine to run, or imperatives. She has long carried a torch for a coworker, but never had the courage to speak to him. Now, she pursues him relentlessly. When confronted, he rejects her, however--not because she's a machine, but because he already has a girlfriend. I'm not sure how a machine reacts to something like this. It's a good thing I don't have to actually write the story.