Why Sai does like this?

I have a doubt may be bashed up for this but I always wanted to keep my thoughts on Sai's behavior see, she says she is an adult tho harkathe kabi aiysa hotha hi nahi matlab you could have informed your husband about where your going what you are doing, especially when he is caring and open-minded to understand everything kam se kam her mother-in-law.What I think is she is the one who gives chance for pakhi to instigate everyone against her.

Sorry If I hurt anyone.