If we're to think about it at all, I suppose we're to believe that, similar to how when Barnabas used the I Ching his body went who knows where and his present day soul-self merged with his past body and soul-self, Eve's body went who knows where and Danielle's present day soul-self merged with her past body and soul-self. And apparently also like the I Ching, Nicholas' medallion took care of sorting everything out once Eve returned back to the present.
Though the real truth is probably that the show didn't think we should think about the logistics at all.
But the real reason I'm posting here is to say that I've finally posted new topics in the "Caption This! - 1796_2" and "Complete This Phrase / Fill In The Blank(s) - 1796_2" boards.