You're right--I did not see that episode with Amma/Radhika chat. I also agree that the TRUTH is not so easy to announce. However, in every situation, and in time, TRUTH always comes out. Hence, you are just postponing the inevitable.
Additionally, Amma will say or do anything to keep Radhika's mouth shut about her vile granddaughter V. Including scaring the crap out of the "limited" Radhika when honor of the families are discussed. Why does Radhika always cave in? While I respect her in some ways, Radhika is a moron time and again. Let her suffer at her own hands.
Are Vishaka's actions any better? Skipping out on wedding to be a Bollywood staaaar, getting knocked up by someone, etc. Can Radhika use these things against Vishaka? Sure, but it would come at the expense of her father too. And Amma.
This show talks about divine love. What I'm seeing this is unbearable stupidity and some tawdry love story. I think even Kanha would like to see this end.