Today we have seen how Ashwini was trying to feed Devyani while the biological mother was busy punishing one girl making her do sit-ups and scheming against another girl with 'chaiwali' whose husbands are anyway not her sons. Even Samrat husband of 'chaiwali' is not Bhavani's son.
This woman is always so desperate to control everyone and everything in the family and this shifts the focus on to her insecurities. She has lost her husband and has no male child, of course this is not at all an issue if we think in general but for a person like her with a regressive mindset it is a big deal!
Bhavani enjoys the privilege of being the eldest bahu of Chavan house. Her biggest enemy Ashwini (before Sai's entry), bore a male child and Bhavani herself has no son and lost her husband as well perhaps when she was quite young and this would have been a big shock for her. Sonali too has a male child of her own and Bhavani's only daughter has become mentally unstable making her insecurities even more stronger.
Bhavani utterly failed in case of her own child but is always busy riding over other's son & DIL. I think she does this to ensure herself her position in the Chavan family.