Brienne and Pod travel to Maidenpool. She learns about the Hound and Lord Beric and his outlaws. She also learns that Lysa is dead and Littlefinger is in charge of the Eyrie for now. She's planning on going there anyway, hopefully just in the nick of time to save Sansa.
She meets up with her old friends from Bitterbridge, where she had ridden to Renly's side only to be horribly mocked and teased for being a woman daring to fight. They take her to see Randyll Tarly, who at Bitterbridge had blamed her for daring to be a woman hanging out around soldiers. All Brienne had wanted was to fight for Renly. Now Tarly is in charge of Maidenpool. He doesn't know where Sansa Stark is but he does know that Lysa Stark is dead and that makes Brienne think that Sansa is unlikely to be at the Eyrie. So close and yet so far!
Instead she meets Nimble Dick who tells her he tricked the fool and two girls who thought they were buying passage across the narrow sea. For a price he will take Brienne to the two girls, whoever they are. But he's probably trying to fool Brienne as well. I wonder how that works out for him.