Because Rashmi keeps poking her every weekend. The whole week these two don't interact and suddenly on weekend they have a face off. Mahira hardly talks about Rashmi but, Rashmi subtly taunts her.
Rashmi was faking concern for Mahira today- 'Mahira do you know about all this about Paras, you should think about it bla bla..' And Mahira exposed her by saying Rashmi was teasing her to propose Paras but now she is acting mature and concerned in front of Salman. Even after that Rashmi was gossiping with Shefali and Asim about Mahira's choices.