HOWEVER,
I think Devyani should ALSO not be expected to even acknowledge Naitik's existence but only be concerned about her husband. She should also not be expected to do anything for Naksh (tutoring, making snacks, baby sitting) . She can do things for Akshara though because Akshara has given her the respect of a mother-in-law. Akshara is not overdoing anything but just having a human empathy for Devyani because Akshara knows what it is like to lose a child.
Simple, it's a give and take world
102