First time replying in this forum, so forgive me if I offend anyone.
To the topic: How will Asha react as opposed to Ishwari's reaction?
Answer is based on our cultural reaction - how Indian culture raises boys vs girls.
Girl are brought up with the expectation that she will marry and leave our house. Even though parents have emotional connection with their daughters, they don't created a "hold" on them. As opposed to boys, who are expected to stay home and take care of their parents. Parents form a "hold" on them and they become insecure when they start to lose that "hold".
Even Ishwari showed this cultural differences. When Neha fell in love with her teacher, Ishwari accepted the change easily. Even when Neha started to get influenced by her Ranveer (i think that's his name). And Neha did not tell her mother about her relationship even after the proposal. When she became aware, Ishware accepted, processed the change (in a healthy manner), and helped the relationship move forward. She saw a good, smart, intelligent man falling for her daughter. And she saw Ranveer as a good partner and support.
When that same form of love entered Dev's live, Ishwari started to get afraid and insecure. She started to resent Sona for influencing her thoughts to Dev or when Dev started to listen to Sona's suggestions. She did not see Sona's intelligent, smartness, or how Sona's influence might help Dev as a support system. She just saw the loss on "hold" over her son. True, Ishwari is attached to Dev a lot more than her daughters, but her attachment is starting to show like a typical Indian mother losing control of her beloved son. Not a mother losing connections to her children (son & daughters) as a generation gap.
Asha on the other hand is like a mother from the western culture. She raised her son & daughter as equals. She never expects her son to take care of her & her husband. And she does not hesitate in accepting financial help from her daughter either. She has deep emotional connection with both her children but she has not placed any "hold" or expectations on either. She might get hurt that daughter was not comfortable in opening up about her relationship with Dev, but she will look at Dev and judge him to see if he is a suitable partner for her daughter. I hope Asha's character shapes out this way.
Even if Asha follows Indian culture, she will still accept Sona's relationship with Dev. Asha will judge Dev as any mother would of their child's choice. And if she find Dev worthy of her daughter then she will be happy about it and support them. Because she wants her daughter to meet a good man who will make her daughter happy. And who is financially secure to take care of her daughter, which Dev is.
I think Asha will have real issues with Ishwari and how Ishwari will treats Sona.
I guess we have to wait and watch how both Mother's characters will be shaped by the writers.