Daadi just mentioned that she would be going to Bihari temple incidentally where amma is also heading. Amma said she was going to ask bihari about the injustice towards her poti. It is quite possible that Daadi might hear that and realize Radhika is the authentic Choti Bahu of Purohit Family.
CBians, lets pray for it. Once Daadi knows the truth, then Rad is going to get much needed support, apart from Dev, at her sasuraal.