Kamili went against her mother and despite her threats gave statement against her father in Gopal's case because it was important for her. Not only getting justice for Gopal but revenge against her parents for all that they have done to her and how they brutally seperated her from Gopal.
So in that case she will against all odds because it is important to her.
She came back to Jhalra despite being angry with her father for killing Gopal because her husband's safety was important.
If she has to chose between getting justice to Mangala and her husband's safety she obviously will chose her husband's safety.
Urmi is concerned about justice for herself and her life and her baby's life.She will obviously chose her baby's life over justice for Mangala.
Just like Mangala just sat and watched Urmi suffer even when she knew a way out for Urmi because she didn't want to part with Nandini.
Serves Mangala right.Today the girls when it came to chosing between helping her get justice and their own interests they chose their interests just like she did.