Hima,
After I read your post...and as I was cooking today, i started thinking on what you wrote about Trishna. That she was quick to blame Padmini for being the reason why Shamsher left them. ..The way Trishna thinks is very simple then...her world of things she built for herself and her dreams. She loves Padmini, Shamsher and Roma very much. And Padmini and Shamsher...yes, she is very possessive about them...so much that she can easily switch their camps if one of them becomes the reason to hurt the other. And she behaves very much of a demanding daughter of the three and we have seen her being unreasonably demanding of them and so much that in frustration, all three have slapped her. She has wept a lot, still had not held any grudge against them.So worse comes worst, she is always going to protect her parents and Roma. If the choice was between saving her parents/Roma and Madhu, she will always pick the other three.If the choice was between her dreams and Madhu to pick for ...I don't know what she will pick up...because Trishna has not come as AMORAL even if she came across as brash, selfish and hurtful. If the other three are safe and provided...we can hope to see that tested. But so far in the story, Trishna has been bad to Madhu when she was totally unreasonable (like in the case of Mukund Dikshit...I mean blindly any given day, I was on Trishna's camp) and when Shamsher was lying in the hospital or her parents were not together.Another thing which is also very clear that, she doesn't really concern herself with Madhu's aspirations and efforts. She heeds to Madhu because she is also the daughter of her parents. Otherwise, Trishna does not have any emotional bonding with Madhu. All that she ever shared as sister was taking advantage of Madhu's offered help...like in case of shooing away all proposed matches coming for her when Padmini tried getting her married...or taking her make-up artist services...So what does that speak of Madhu ? That Madhu does not know how an elder sister is supposed to take care of a younger sister. So Madhu is as much a single child whereas Trishna had been getting the love of a sister, though she was not being a true sister.in conclusion...my ramble now decides that Trishna is a daughter with vested interest in her parents. However, she is not a sister with vested interests. She may protect Madhu, only if she were to know that her parents would be aggrieved if something were to happen to Madhu.