Here's one of Chelsea's exit interviews. I had to laugh at this part:
I was wondering the same thing.
She talked about wanting to play it safe and stay under the radar in the beginning, and not be paranoid by going into the vote asking everyone over and over again if Karishma was still the plan. Maybe she played it a little too quiet and safe (and maybe shouldn't have gotten in the briefest of showmances on top of it).
Then there was this:
Maybe Elaine is just smart not to call it like she sees it.
She also said that on day 5, herself, Missy, Elizabeth, Aaron, and Dean formed a new alliance together and the plan had been to target Karishma.