I presume the majority of the plot takes place on the station? Just out of curiosity, really.
As mentioned before, does the woman serve a meaningful purpose. Is it necessary for her to return in order for the story to develop? Additionally, does she need to die in order for the story to develop? Which would work better?
How much of the plot have you already planned? If the answer is "all of it" then see if she would fit in later on.
If you only have a certain amount planned out, then it might be worth it if you write a rough chapter brief for each chapter or event in the storyline. This way you'll have a much better idea of where she fits in, if she needs to.