Nandini may try to take blame on herself to save karan .....
Nandini knows Karan is innocent and she also knows that karan can do any thing for her , Nandini loves karan to the extreme just like karan does( pointed in yesterday's episode by tanya and tulsi ). Nanini may try to take blame on herself to save karan's life she knows she is pregnant and if she accepts the crime now it will look like a drama , hence she is trying to create a scene that some how she can take blame and save karan's life !This way she can save karan's life plus she wont be punished much as she is pregnant so this way both nandini karan are saved.
At the time of gujral's murder nandini was inside the party with damini ganga ,karan came later to nandini outside when they were alla rd gujral's body.Since that time when karan took blame on himself Nandini fainted and could not do much , now she can save karan easily by making herself look like culprit and because of her being pregnant she wont be punished much !
Its very possible that Nandini has been told by karan what he saw on terrace and they have made a plan !lets see😊