She knows that she has jumped into fire by marrying Sattya. She got herself in to this marriage after knowing all the pros and cons. She knows that Sattya will leave no stone unturned to torture her. But to her, Sattya's fear is nothing compared to her urge of hurting Raghu to bring justice to her father. She has no doubt that Raghu loves her; hence she is doing everything to hurt him. Her revenge and hatred for Raghu is as strong and intense as her love for him. She doesn't care what obstacles she will have to face in this path but she is ready for anything and everything.
The precap showed that, to what level her feelings for Raghu has reached that she is not caring about her honor now. She is ready to burn in the same fire that she lighted to burn Raghu. Her revenge has become bigger than the torture that she has to bear every moment with Sattya. According to her, Sattya's threat is slowing her down to reach her goal. She shed that fear in precap by throwing her dupatta. She knows how to control a badass; she became a bigger badass than him. By throwing her dupatta, she defeated Sattya by telling him that even if he forces himself on her body now, it won't matter. He will never ever reach to her soul. It's already taken.
Let's applaud to this brave intense lover Antara Kaul. She proved that she is stronger than she looks. And for those who are afraid of whether Sattya is going to do anything wrong with her, just throw the fear the way Antara threw her dupatta. Sattya is too small in front of this brave girl Antara for whom even her hatred for Raghu is greater than this mere fear of losing her prestige.