Hey guys, new to this forum.
Some ideas I have about Devyani.
It is shown that Devyani was in relationship with the doctor and wanted to marry. What I think is Chavan's were against this since he was still studying (Devi told Sai that her husband was studying medicine) and not stable financially. However Devi gets pregnant with their child before marriage due to which family is forced to get the couple married. Kaku hates her daughter because she got in a relationship, kept it even after family refusal and top on that got pregnant (and lost her scared virginity) before marriage. When Shivani was confronted with Amay's wife, Kaku says daughters of chavan's always do their muh kaala. In case of Shivani it was relationship with a married man, for Devyani it could be getting pregnant out of wedlock. I seriously doubt that it would just a relationship. Later, Devyani is somehow responsible for her child's death (or at least world thinks so) so she lost her mental balance. Since family got Devyani married because of the child, now that the child is no more they shoo away her husband and in a way cage her in the her own home, so that the skeletons remain buried.
Would love to hear from you about this