Rachel started to laugh a little at Ivy, just 'cause she thought that she was joking about the tomato thing. Then when she realized that she wasn't her eyes got wide. "You're joking, right?" They were already on to other things so she just let it go and didn't say anything.
Up until Ivy said what she said about Kist. That all hit her like a ton of bricks. Ivy was from a different time line. Which meant that she didn't know about the deal she had made with Al or anything. And, what had happened? Didn't happen. It hadn't happened yet for her. "Ivy, um... just forget I said anything, okay? Sorry." If Ivy didn't know, than maybe it was for the best. She didn't want to keep anything from her though.