The discussion has gone astray - in the wrong direction, as far as I can see. The question here is not about the actress but about the role in this serial. However, often the CV's give some roles to the appropriate actress/ actor, according to their personal characters. So, the sensitive, gentle, sincere and goodhearted persons sometimes cannot play the negative role - just because it is not their personality - such actress/actors will be in conflict with their character and their personality. Also, if some good actress could successfully play negative role all the time and are much better in the role as negative persons, it must be in connection with their personality as well. But, we are not discussing about the actress - she has done great job, but as a role, Tapasya is negative, no doubt about it !
Do you have some personal experience that somebody you may now among your friends or ppl you know are extremely negative person by character - evil person, jealous, selfish, egoistic, foxy and intriguer etc., did such kind of person could be changed suddenly, just like that , by single "click" and the negative person turns to 100% positive !! Noway - it is not possible in real life. Personality and characters are formed in early childhood - and cannot be much changed later on. Such kind of person ( negative ) could only pretend that has bee changed and now became positive. This is the case with Tapasya - she has shown herself so much negative in every single respect towards her friends, her parents, her husband, child... what else she can do ? Steeling husband, be jealous on friends success, beauty, happiness ... this endless negative behaviors - this cannot be forgotten or forgiven - whatever CV is trying now to do to correct her character , for me this cannot work !! I can admire to the actress, but cannot say that Tapasya role in this serial is marvelous !!