I get it now. In season one when Ned was talking to Arya about learning to be the proper little lady like Sansa was, Arya said to Ned that "wasn't her". She wanted to learn how to sword fight instead of how to dance. So when Arya said that to Nymeria (it was a call back to her and Ned conversation) it was her understanding that Nymeria has a pack to lead therefore she can't expect Nymeria to go back to being her pet direwolf. It's not her anymore. She's no longer Arya's pet. It symbolizes that they both have changed since they last saw each other.



I was a little disappointed in Theon, but I realized if he tried to fight Euron , Euron would have killed him and Yara. This way they both live