I think Sansa passed that interview with Arya (when she gave her the knife). I think/hope Arya is smarter than the angsty teenager she is acting like and just testing Sansa.

Littlefinger also tried to provoke Sansa to bring Brienne into it but then Sansa had Brienne sent away...so maybe she is onto him too.

In the finale preview Sansa has the hood on and is definitely up to something.