Misti,
Very well written description of Radhika's persona. She is such a serious person for somebody who is only 20 years old. She rarely smiles and does not understand jokes. When Vaishali was joking with he about making everything that Dev likes, she remained serious. Vaishali had to assure her that she was joking.
Dev is the only person whom she teases or with whom she smiles or laughs. Even with him initially, she wouldn't do that. But, then during the engagement, she started opening up and starting smiling with him, teasing him and even sharing things with him (her dialogue to Dev when she was talking about Vishaka - she said that she knows it wasn't his fault but he was the only one with whom she could have heart to heart). Now, after the wedding she is quite open with him comparatively. But, with Vishaka incident, she is back to hiding things from him as he so sternly told her not to talk about Vishaka.
In that sense, Dev and Radhika are totally suited to each other as they polar opposites. He is so gregarious, sharing every thought with her and she is so guarded and mute (mitbhashi in hindi). He likes to play pranks and she only talks about serious stuff. He is very impulsive and she is very analytical except when it comes to Amma and Vishaka.
I hope the creatives show that Dev finds out about Vishaka first before any other family member. They need to have this conversation by themselves without any interruption from good family members and bad Purohits.