Who will end Sansa's life?

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Based on her character arc and the great deal of time that GRRM has invested in her,  I think Sansa is one of the more likely characters to make it all the way through to the end. To this point,  Sansa has contributed very little to the story for her own sake,  acting more as a viewpoint to other events within King's Landing and the Vale.  It could be that this is the only purpose she serves,  but I strongly suspect that Sansa has another important purpose that we haven't seen yet and that's why she keeps hanging around.   So no,  barring a major change in circumstances,  I don't see Sansa being killed off anytime soon.  

As for Stark vs Stark,  no,  I really don't see it unless its something between Sansa and Arya,  and even then,  I think its unlikely.