Still playing Devil's advocate.
IMO, she suddenly realized that she didn't WANT to know the answer, that she didn't want to die, and that's why she started outspokenly questioning herself. Note how she switches from know-it-all super detective mode to completely terrified. She was looking for an excuse not to believe her own eyes, and the guy gave her justification.
My question! What the heck is up with her insane cleavage this entire series? I mean, Siberia's kinda cold this time of year.