Shweta, they never thought of this far. To begin with, they never counted on GDA failing miserably and how all this would affect them individually. Immaturity at it's best. Now they are afraid of the repercussions CM truth would bring. And Nisha is being an ostrich.
Forget Nisha, she's not accountable to VJ, Kabir is. He should be the one to think what he intends to tell his mom.