I dislike what Carly is doing to Bo and I think Bo is STUPID for even thinking about Carly that way.
But as for the elevator, I totally understand that. If you are claustrophobic you will act that way depending on how serious your case is. So killing someone has nothing to do with tight spaces, therefore her reaction to it would be completely different. So I get her ranting and raving in that scene, that was VERY realistic. Especially since she knew Vivian had something to do with it.