My take on the episode.
First a wonderful episode. Ishwari was more upset because Dev listened to his wife and not entirely because Dev took a decision of not assigning a high level job to vicky. Yes she was guilty because she couldn't help Vicky which is her way of returning a bit of ehsaan by her brother.
I felt, Ishwari's reaction was quite valid, its not about how much money Mamaji had helped her with, but about the time he came to help her and the way he helped her. He broke his ppf for the medical expenses of Riya or else who knows perhaps Riya wouldn't had been alive today. I have seen people getting extremely cautious even about their FD's when it comes to they might have to break it and breaking ppf its a huge very huge thing. Some may not understand the value what it holds for a salaried employee, but not everybody can do so and not everybody does so selflessly like mamaji did for Riya. No matter how much money Dev returns to mamaji, it will never equal to the help he provided then, never. Offcourse, mamaji never asked for this return of ehsaan but his wife n son wants all and more in return.
When a person is subjected to harsh realities of life, tough situations, bad situations like the dixit's had to go through when after Mr. senior Dixit died, one can never delete those moments from life, no matter where you reach in future or what you become in future. No second person can ever truly understand that situation no matter how much he or she claims to understand or try to understand it.
Sona had heard all about Dev's childhood at the time of her accident, but can she relate to any of it, no absolutely not. She is an outsider to that experience and will always be. Dev was right, she can never understand, she never understood what Ishwari, Dev and Neha had to go through. She may say I love you to Dev, but nonetheless she can still never understand what someone feels when their loved ones are on hospital bed and hopes of never getting treated strikes your mind.
Sona had a very comfortable life unlike Dev or other dixit's.
The way Sona came and said to Dev, no matter who says what (seriously its her MIL she talked about) but I am with you and your decision of not appointing Vicky at high level position. That was so inconsiderate and insensitive of her. She was trying to put Ishwari down by her comment. Does she not think Ishwari means anything to Dev (forget about what she thinks of Ishwari for her). How could she even say something like that when she clearly saw how upset Ishwari was. Is Dev's business decisions above Ishwari for Sona.
Yes Dev lashed out at Sona, but that was bound to happen with the way she kept coming on to him inspite of how clearly he said to leave him alone at that moment. Even in the precap, Sona is more concerned with a decision that does not directly affect both of them (not her for sure) but she was all so defensive when Dev questioned her about her decision of Fasting which affected both of them directly. Really didn't expect this from Sona. Its like she is fighting for her position with Ishwari. Her ego was forefront in both the scenarios.
And lastly these are strictly my comments and views. No offense to anyone's POV.