Nandnini is definately not the murderer. She went to see that Gujaral's man becoz he can say in the court that Karan was drunk during the murder time. I think that is the reason she gave him money so he does not change his statement last minute.
She definately can't do that. Virani's always have habit to over judge their family members while the outsiders take the whole advantage of it. 😆
Only thing i did not understand about Nandini is why she said to Savita that she is 60% owner of Virani industries. May be to show her caliber.