I hate it for all she has done, but then if we think deeply probably she just wants love? she is doing all this revenge etc out of a sense of misplaced loyalty. Umang was the first person according to her to show her love.
I mean her Mother was an insane person from the time of her birth till she became an adult and she was tied to her mother's wrist all the time. So love there ?? not really only paranoid behaviour of her mother. Her father--probably was travelling and earning money for the family (even abroad possibly--he had a lot of USD in his trunk before Radha's marriage to Umang).
After Gopi was found, the parents showered all their love on Gopi.
Then after she started living in MM, Rashi -- did kalakari's and almost turned her into a servant.
Gopi- even though she loved Radha, Rashi's kalakari's made Radha think that Gopi hates her and this was cemented for Radha when Gopi confronted her with her behaviour towards Koki and her actions leading to Jigar-Rashi almost divorce, their refusal to accept Umang, and the entire Modi family sending her "Bhabhi" to jail.
At this lowest point of her life, Umang plotted and she met Umang , fell for his fake love and she still refuses to beleive that he is/was a fraud. She was shown as a good person in the beginning but circumstances changed her and now she is blind with wanting only revenge.
I am not in anyway condoning her behaviour, ( she went to the extent of harming an innocent child and was happy doing it) ,
but at the same time she harmed only Meera, not Tolu Molu. If she wanted revenge on Modi's she would have harmed every single child in the family, so that means her revenge was only against Gopi (for killing Umang according to her). So is it jealousy that she lost mother's love also because of Gopi.
I am simply trying to understand her. I pity her sometimes, Probably she also just wanted love and family but fate was against her😕