Its imperative that whether Rgaini or Sadhna wins, the money will go to Mami's operation. Both are daughters, it does not matter who gives the money. Money can be earned in many ways. Till the point, its utilised for a noble cause is good.
But the question is Ragini's character needs to be redeemed in such a way that even the worst critic will have no hesitation to say that yes, Ragini has indeed changed now and that too for the best and also noone can have any doubt that Ragini loves Sadhna. Its not conviincing for Ragini's redemption that she wins the competition and gives the money to Sadhna. In that case, it appears that whatever she did and said to Sadhna was right and that she has no remorse, which proves that goodness is being killed and has no value. Sadhna's dance by Ragini;s support and thus Ragini standing beside Sadhna throughout to let her the competition and Rgaini standing like a barrier between Sadhna and Vasu is the demand of the day for the complete redemption of Ragini's character.