Solo said:She was upset over something Dr. Frankenstein said which paralleled her situation ("I looked into her eyes and I knew it wasn't her") and she finally cracked and told Peter basically that she couldn't handle it, and was quite sad that he wasn't able to tell he wasn't with Olivia. Anna Torv sold the shit out of it.
Thanks to everyone who answered. I guess I'll have to check out the last 10 minutes on hulu tomorrow to catch the scene.