Firstly, we all knoe dat roshni had a sympathy kind of look wen jai insultd bani in front of her. Dis mayb is da first sign of her positive character.
Secondly, after aditya goes giving a big lecture to her, roshni says to herself dat if da secret abt her n jai's past is revealed to bani, then there will b a storm. Da fact dat she hasnt reveald dis secret to bani so far, only means dat mayb she wants it to remain it as a secret only.
And lastly, da article dat mentiond abt roshni's entry, further mentiond dat her entry will bring jai n bani closer. This further confirms my view dat mayb roshni is a positive character who is trying to get bani n jai together. And mayb she was rude to bani at da party bcos jigs was also there and roshni wantd jigs to assume dat roshni is indeed wid her!!
Phew!! Now dat was quite long....😆 ...please do share ur views on this guys 😊