1. I think she is happy because Jon has said he doesnt want to be King or anything. He basically just wants to unite people against teh WW. That's all he really gives a **** about. So Sansa is like "Ahh shucks I get to be Queen?" but I think deep down she really wants it. Even though Jon might not really want it, the people are going to make him King because he is a natural leader and people respect him. Sansa might get jealous. IDK. That is the driving motivation behind LF's action, right?
2. Yeah, she has definitely gotten stronger, but I think she still yearns for some sort of power. She doesnt like LF or Ramsay, but she has shown traits of both the last few episodes. She lets dogs eat Ramsay to kill him (a Ramsay move) and she goes behind Jon's back and isn't honest with him (a LF move).
3. People don't seem to respect her. She tried to talk to those two houses (one was Marmont and the other I can't remember the name). Neither house leader seemed to very receptive to Sansa.