Even with Natasha, no one really made comments in front of Ishwari. The one time Nikki says about the changing of things, Neha stops her and taker her away. One more thing at that time is Dev's reactions. He was not really changing anything including himself for her. The sisters never saw much enthusiasm in his words regarding anything, be it changing the look of his room or selecting the engagement ring. He still left everything to his mom. Which kind of made Ishwari not so insecure nor this much possessive.
But with Sona, Dev changes inside out. He is now happy, Latakia about colors, includes Sona in everything. They can see that their brother is deeply in love with Sona and is believing that his mother did approve Sona. He thinks that his happiness is doubled.
But knowing the truth, the sisters are more concerned for them. They know that the truth will eventually explode in Dev's face. They also know that, Dev will choose Ishwari over everything, even sacrificing his own happiness. This will also hurt Sona very badly.
The sisters don't want any of this to happen. They are trying to be cautious and realistic along with hoping and praying that nothing bad happens.
I hope Ishwari does realizes the truth before it is too late.
Sorry if the post is too long. 😊 🥱