After reading all views, my point is that I understand why Sai gave the pendant away to Bhavini so she has peace of mind and there is peace in the household.
However, my issues arises is Sai's lack of understanding that it could hurt Virat emotions if she did that. Its been shown that she doesnt take into consideration his feelings when doing that. Even after doing and talking to Ashwini about it, she seems unaware of the fact that his feelings are hurt. She shouldn't assume he is fine with it as no one will be if you gave someone a gift and they gave it away without considering your feelings on the matter.
In this instances, giving the pendant away was understandable: yet not realising afterwards that Virat is hurt by her actions and assuming he will be okay with it were totally wrong in my part.
So all in all Sai was right in some way in this matter but way more wrong for me. Ashwini is right: Sai should act like Virat's wife first then Chavan bahu afterwards as the Chavan family dont even consider her family so why should she take their feelings into consideration? If she has to choose between Virat and family as 1st and 2nd priority, Virat should be first over Bhavini and everyone.