I could see that, but The Hound is also up at The Wall by now too, no?
I was wondering if they are setting it up so that she kills LF and assumes his identity to get into Kings Landing.
I think the Stark reunion is too easy, and they will go their separate ways again soon. Jon goes back to do battle up north, Arya goes south to kill Cersei and The Mountain, Sansa stays put, and Bran has to go find a special tree for some reason? Dunno, just have the feeling they aren't going to be together for much longer. I could see another one of them biting it soon too.