I don't get where the confusion is ... it seems very simple ...
The Chhanchhan Umaben confrontation changed the equation between Chhanchhan and Umaben ... Chhanchhan has got rid of the threat to her marriage once and for all by disclosing the Sonali story, but also she saved Umaben's face as well as her relationship with Manav ... both Umaben and CC knew that if Manav got to know of UB's role, he would have walked out of the house. He had done it once before, he would have done it again. CC saved that relationship along with her marriage ... hence UB acknowledged that she was wrong in thinking CC was wrong for Manav ... CC was the right girl for Manav, because she valued ALL his relationships, not only her own.And Chhanchhan understood where UB was coming from ... hence she deleted the video ... by doing that she acknowledged UB's explanations of her actions, and that UB's actions had basis in her own history, and were not just out of sheer evilry ...That was where she forgave UB ... After all, Manav had said very similar things to Chhanchhan too ...But UB still feels that she has preserved the family unity and Chhanchhan with her modern thinking will split the family ... so while she acknowledges CC is right as Manav's wife, she feels she is still wrong for the family. UB has preserved the family by following the path set by her MIL ... Chhanchhan wants to preserve the family but NOT by following UB's path, but by treading her own. Which UB is not ready for ...This is not a regular antagonistic saas fights bahu story ... this is a situation where both women actually have started respecting each other, albeit grudgingly ... started to see the other's POV ... but still both hold that their own path is correct.