Rimi said Rochelle gives her pep talks on a daily basis to do well in the challenges. So we have no idea how much pep talk it required today to get Rimi to do the task. And also for how long. The groups did the task all day and from the looks of it Rochelle and Rimi did very little. They looked like they were just enjoying a day in the sun. By the end of the night everyone looked like they ran a marathon and those two beauty queens looked perfect. Even though Vikas mentioned food to override Rochelle's argument about the task at night, what he was basically saying was
don't worry about what we do in the task, we are doing more than you anyways. Rochelle wants to do well and it is not fair that she has to carry around deadweight Rimi. The reason Rimi sat there and looked pretty was because she knows she is dragging Rochelle down. There is nothing to defend there. It is the truth.
Rochelle also mentioned earlier she wants to be captain. But you have to do well in the challenges to be captain. With Rimi that is impossible. Rochelle's frustration is totally understandable. Her outburst and her tears were annoying but she has every right to point fingers at Rimi when Rimi is what is holding her back.