I think Tapasya’s negativity for ichaha is right to some extend coz if your father will favour some other’s child to such an extreme extent then is quite natural that jealous factor come in play.
Also with wrong guidance of tapasya from nani since her childhood she definitely will be against Ichki because its human nature no body would like some other girl to take her place in a family which purely belongs to her.
But the way by which tapasya express her frustration is wrong she is following wrong track and becomes a villan by crooked thoughts so in my view its high time now her parents have to understand her too and with proper guidance from her maa and paa she should be put in positive role.