I agree, they suddenly thought of bringing Naani in again, but forgot when Naani was in the Modi house she never got to know Gopi was an illiterate, if she had known Gopi was an illiterate she would have said so to Kokila when she decided to give the contents of the sandook to Rashi, Naani explained the first relation of a married woman is her husband and her husband has not accepted her, she could have gone further at that time to say it's because you have chosen an illiterate and Aham cannot abide illiterates, thereby the education track would have come out of that track.
So they are trying to back track meanwhile we know Naani never found out Gopi was illiterate until now. What she should have said that two sisters one so educated as to go to college and other one didn't even do primary school, at least teach your child basic counting and reading/writing in hindi.
I was hoping the whole time Naani was there she would find out about Gopi being an illiterate and taking care of it then, instead they decided to hoodwink Naani that Rashi and Jigar have a real marriage, which we know they don't. Now they are trying to hoodwink us viewers about this now.