"Listen dammit! You step outside, you risk your life. You take a drink of water, you risk your life. And nowadays you breathe, and you risk your life. Every moment now... you don't have a choice. The only thing you can choose is what you're risking it for. Now I can make these people feel better and hang on a little bit longer. I can save lives. That's reason enough to risk mine." —Hershel to Rick and Maggie about the prison and the flu
I say episode 2 since she doesn't show up in the cabin crew in the trailer after they left the cabin and headed towards the mountain (as far as I'm aware), either that or episode 3 as that seems like the time for killing off a lot of characters.