Yes, I also am eager to know what would be the master stroke of Sakshi. She had planned all the time after Shaurya got attacked.I dont think she had planned for Dev and Durga's marriage from the start.
She only would have wanted Shaurya to back off from the wedding and what would happen next is still a question.
Dev knows that his family is responsible for Payal's condition and for Nitya going missing. But he is not taking any step to get justice to Payal. I know its not easy to bring the Goenkas to court just like that esp when he has his own mother who shuts him up whenever this discussion comes. But we have not shown any plans of Dev except trying to find out Nitya and know Durga's secret.
So how would he say yes to his marriage with Durga if such situation really arises.
Durga, is over confident that Sakshi will now allow the marriage to take place and she is sure to win once she becomes Goenka's bahu.
She thinks right now by exposing Rajnath's affair with Raima, Sakshi's attention would get diverted. But to Sakshi, her son is more important than anyone else. And Durga also has this possibility in mind that Sakshi might send Shaurya away for his treatment.
So what exactly Durga has in her mind to get her revenge or justice for Payal is still not made clear.
She thinks, things will go her way once she becomes Goenka's bahu.
But it is not clearly shown.
It would only be more difficult for Durga if she gets married to Dev. She cannot so openly take her revenge on Shaurya and his family when Dev or Suchitra would also get affected with the things happening in their family.
Waiting eagerly for that episode where a huge drama is supposed to take place.