Actually what shei s trying to show is that if they excahnge thier roles, it will not bring happienss and cmfort, so even if they have double rishtas their khoon ka rishta will always be more strong andwill prevail over all. that will releasied when roli says shedsnt want jeethani devarani and wants sisters only, thus thier bond will be stronger. she does realise that it will cause pain but it is necessary to understand what the relationship meant, it is said when you lose something you know its worth, so by pretending the sister bond inferiro to new bond she is ensuring that the bonds importance is renewed and it never happens that a new rishta replaces the rishta they are born with!
als oi feel she suspects matjis involvemnt too and is treadinng very carefully, roli as much as smart and frank shei s impulsive andit is too soon for her to know, once they both are back to as before then as per sbs mm ki band bajegi!!
i also want thatonce simar nad roli fight ends roli teaches simar how to speak and not bend over, roli is really very impressive as a young girl who has self respect, simar is too soft ot be real!! kabhi ou munh mei zaban hu, but it was always that she never spoke to her dad too , she was always a quoiet person but i hope roli makes her a lil brave and she makes roli study and achieve her dreams!! i feel sad poor roli is now just cooking and doing household chores at this age!