User blog comment:Pawn of Atlas/Important Discussion for Rapture Storyline page/@comment-1500935-20140403184252/@comment-1500935-20140404232458

@Key of Destiny Alexander also mentions in his diaries how she went "mad" and "bit the company's hand," but the original game shows perfectly her gradual change of behavior towards the Little Sisters.

I'm going to say Elizabeth visited Rapture twice: the first time (and shortly) in 1960, and the second time in 1958. From the perspective of the Rapture universe, Burial at Sea happened before Songbird was drowned. Also, I'm beginning to think that Ken Levine intended to show only one reality in Rapture and the same as the one from the first games. Perhaps that's what he meant by saying "Rapture Prime," though I don't like how convenient it is for him.