She left pari with arjun and ovi for the betterment of their marriage and since the marriage is still not working and seem to be getting worse, then she did the right thing by stamping her authority.
Arjun was doing a great job looking after pari and Ovi was given ample time to decide what is it she really wants with regarding her marriage and pari. She decided to gave up her marriage and pari. So no need now for her to come and behave as though she cared for pari more than purvi and now she wants pari because purvi has decided that enough is enough.
It is my sincere hope that purvi does not get weak again and try to be mahan again just for her 'so called' sister that never like to see her happy.
Absolutely my point of view