"From what I understand, there's lots of different Earths. So we're probably from different ones. I wouldn't worry about it too much."

It seems the safest answer. Nadine has no way of knowing which Earth anyone's from, if they're from the past. There was no warning, no long lead in to the end. It had all happened in roughly a couple of months.

"I never made it out to California. Are the beaches really as pretty as they look on TV?"