Yeah.. I kinda agree with you. Sometimes such things happen in your life that you don't remain yourself anymore. I feel like she knows that bad stuff has happened to you. I mean I dont care why she was marrying Agam, but the thing was that she was getting married. Her marriage has broken. I would be shattered to see all my jewels taken away from me and put on my own sister. Even though Nimrit did it for good and she wasn't ready on her own, but still Amrit's heart is broken.
I feel like Amrit is confused between what is wrong and who was responsible for it. She just wants to escape it, escape the reality but she doesn't know how.
The thing is that she is aware of the fact that Agam wanted to take revenge on her, still she wants him as her husband. I am sure that she will once be succeeded to make Nimrit's life horrible, but she won't feel good about it once it will happen. Then only she will realize that Nimrit is a true sister.