Shakuntala is so selfish she will never expose shefali bcoz then shefali might stop helping arjun with finance etc and she is the only person to manipulate mansen.Shakuntala also was selfish enough to keep it a secret that suraj is her son bcoz it would upset her cosy little life.
shakuntala also never approved of bhumi so i am not optimistic abt her exposing shefali.I think suraj or keshav will do it .