Surely, she has been the 'man' in this relationship - more mature, sensible and giving to Dev versus him. However, my hunch with her is of not expressing her true feelings post marriage.
Why is she not vocal about her insecurities (which do exist) as a newly wed.
Either we see her getting angry (like on the first night - which was reasonable though) or arguing with Dev or giving into rituals.
She is a 21st century woman, well-educated with a strong EQ. She is individualistic with a strong influence on Dev through her logic. But we all understand that even the best of us have days when we are bogged down with negative circumstances around us.
Why isn't she accepoting to her flaws with Dev, just like the way he does? This facade of being a 'giver' is not making her seem natural - its like either I will fly or I will die , there is no middle path for me!
Sona was disappointed (just like Dev) when he had to go and drop DB. Her efforts for morning puja proved futile plus Ishwari's rant that made her cry, the navratri fasts came upon her by trap... why is she taking it all in.
Yesterday's car conversation between Dev-Sona was a perfect place where she could have simply stated 'I am doing all this because I want to impress your mom. Because I know your mom means everything to you and I can't afford to lose you again. I want to be accepted by your family (your mother) and have to prove myself as a good bahu, so that i am not let go off by you again, since I couldn't meet her expectations."
That would have shaken Dev. And would have added so much more depth to there newly found marital status. Sona wants his support but she will get it in a true sense when she exposes her true vulnerabilities!
That's my POV. Hope it makes sense.