5 Things Arya May Do After Reading Sansa's Letter

Now we get to the most heartbreaking option. Sansa truly fears what her sister has become. That's clear from the look on her face when Arya duels with Brienne. We know that Arya is volatile and prone to taking vengeance against anyone who has done her family harm. It's not beyond the realm of possibility that she will become violent with Sansa or Littlefinger, leading to Sansa kicking her out of their home. If this happens, both women will be playing right into Littlefinger's hands.