All right, this was good, she recognized America. Or at least that's what Elphaba inferred from Marguerite's audible response. So it would at least be somewhat easier to explain everything. Maybe. Well all right, maybe not, but she would at least try to break all of this gently.
"I know this will sound completely insane, but bear with me. You were brought here by a Seal. It's kind of like magic, I guess is the best way to describe it. It's like that because the Apocalypse is happening here. The biblical Apocalypse according to the Christian bible." Elphaba would let Marguerite think over that information. Yes it was hard to digest, especially if one wasn't religious, or even if one was familiar with the Bible it could be difficult to take in.
Smiling gently, Elphaba nodded. "It's a pleasure to meet you. Even though it's under crazy circumstances, but still." And then it occurred to her that she should probably let Marguerite know what year it was, since by the way she was dressed she probably wasn't from the current year. "It's also the year 2012. July 2nd, to be precise on the date."