Check out this sneak peek at the Fringe season three premiere. It features Olivia in the alternate universe, repeatedly making her case and insisting: I'm not crazy.
Added:

Fringe Season 3 Episode 1 Quotes

I'm not crazy you know. To prove that to you I'd have to tell you some things that are even crazier.

Olivia

Peter: The whole time I was in there, there was only one thing I could think about.
Bolivia: Yeah what? (Peter then kisses Bolivia)
Peter: That.