The only person who knows she's actually Sansa besides them now is Robin. Everyone else thinks she's his niece. Remember, Sansa had never really even met her aunt before. Nobody in the Vale knows what Sansa Stark looks like for the most part. Don't think she's ever been to the Eyrie. Why would she give a fukk about her crazy aunt that tried to murder her when this bytch just tried to kill her, and Littlefinger is the one who saved her and also the one who saved her from being executed for Joffrey's murder as well as pretty much looking after her in KL. I think she's gonna remain loyal to the dude. He's molding her, breh. I think she might starting to accept it too.