I read Arya's line, "That's not her,” as an echo of what she used to tell her father, "That's not me." Nymeria is a wild animal. Being queen of the Winterfell kennel, which is what life with Arya would probably mean, isn't her.

What have we learned on GoT this week?
Serpentine!
Jon Snow really isn't much of a general. Hey, Jon, you're fighting the most loathed man in the realm. Play that up. Maybe someone in the other army wants a lordship? This is the guy who murdered their rightful lords three times over, raped the heiress of House Stark,…

What have we learned on GoT this week?