A lousy stupid question

Kapoor sisters have ganged up with Veer and his mom Roop to get Saumya married to Rudra and ultimately destroy Oberois. They have been working in this together. Now my stupid questions
Saumya loves Rudy and wants to marry him, but destroying Oberois means destroying him too ❓ Tia has a soft corner for Shivika and wants to warn them against the danger and also about how their past is linked to Kalyani Mills tragedy which can affect Shivika's relationship. But "Annika ko to Shivay ne maar diya, yeh to duplicate hai na as per the villains. Then how n whoz marriage is she trying to save? And how can she blurt out the truth to Shivaay infrint of Annika when she is ideally in Veer's gang. She is either suffering from partial Amnesia or she would need to run past a few episodes to get updated on what's happening around the storyline
And Saumya has become so evil that she ddnt even protest when Veer wanted to dispose off Tia 😕
Strange!!

Well
About Tia she wanted to save shivika's marriage when Annika was alive.. May be now she wants to say the truth because Annika is not alive, or it could also be like she suspects krr to be Annika, I mean she was the first hand witness to all the nautanki shivika did.. Or it also could be that the whole gang knows its Annika and simply acting like they believe it's krr..
Rahi baat Sumo ki then in front of her, veer only talked about taking Tia out of OM, he did not say he was going to kill her.. And he was actually not trying to kill her because he told roop that after injecting that Tia will be unconscious for few days.. But only to krr he said that he tried to kill her so he was trying to scare krr and to make her believe that Tia is unsafe..
And about destroying Rudy, she may think Rudy will have soft corner for her because it's because of his family she lost her father.. She may think they can start a new life after that..