Paras had pointed it out in one episode but Shehnaz kept denying it. However, in yesterday's episode, Shehnaaz told Aarti and Shefali that Siddharth had a problem with her talking to Rashmi, and Aarti too accepted it. So this was the real reason behind Shehnaz suddenly turning anti-Rashmi because she didn't want to displease Siddharth. Although I don't like Shehnaz but she was right that if he had a problem with her talking to his nemesis then how is she wrong in expecting the same from him with respect to Himanshi.