Who is asking Ish to fall in love with Sona but Ish should atleast give some due respect to Sona, after all Sona is Dev's wife now, she is not just some nutritionist working for them. Is it too much to ask that Ish show some respect for someone who is part of their family now. Look at Asha - she has happily accepted Dev and there is no pretense at all.
And one of the way is to help Sona out with right intentions...not like last time when Ish taught her to make halwa, but when it was bad she still made Dev eat it so that he can mock Sona's cooking. Ish has to try and help Sona feel comfortable in new home, not make her feel like outsider.
What Ish did on their first night - made a big scene and when Sona wanted Dev's answer, Ish called Sona as her son's zid, so she still doesn't see Sona fit for her son. Ish has made it very clear, if Dev would not have been so crazy abt Sona, Ish wud have never tried to get Sona back. And Ish didn't stop Bua or Gkb while they insulted Sona. They agreed for non-veg in the wedding, it was Ish's mistake they didn't tell Dadi Bua about it beforehand.
She has got the prenup signed by Dev without his knowledge coz she doesn't want to give Sona any money. So Ish has already thought about marriage not working out. Does such manipulations show Ish is trying to accept Sona? I don't think so. The problem is Ish will never genuinely try to like Sona but Sona makes a lot of efforts to get accepted by Ish and rest of the family.
And offcourse Sona would try and help out her MIL...she wud do it like she wud try help her own mother. Its only natural that DIL wud help in house work like members of house do. Sona is not trying to snatch Ish's hold on the house or on Dev. She respects Ish n treats her as the head of the family. But Ish is making it clear that Sona is only Dev's wife and not her DIL.