Question about ellen (Season 6 spoilers)

In season 6 episode 16 I didn't hear anything about ellen, I thought she died in the building with Jo, But in episode 17, shes suddenly back and married to bobby and has been hunting with jo?

Is there something i'm missing or?

Edit: I havn't finished e17 yet, but so idk if it explains it later on in the show, but sam and dean know about her being alive in the beginning of e17, so it seemed weird to me.