Originally Posted by Red Brooklyn
I've read every book. But I don't recall the specifics. Would you mind refreshing my memory?
Thoros, after Brienne wakes and everyone in the BwB is taking orders from LS: "When we found her by the river she was three days dead. Harwin begged me to give her the kiss of life, but it had been too long. I would not do it, so Lord Beric put his lips to hers instead, and the flame of life passed from him to her."
That is near the end of A Feast for Crows, so it's been basically an entire book between readers finding out she's "alive" and finding out how it happened.