Sansa had nothing to do with Dany getting killed by John. That was all Tyrion telling John it was either him or her and she would have killed him the first time she had a chance. Sansa was just a spoiled brat who was a musical chair prize. Let her have Littlefinger, although I do not think she figured him out on her own, I think Arya got that plan going. I liked Ramsey better than her, anyway. At least he was funny, Sansa was just whiny and bitchy.