Well I was expecting this fight , but both Neil and Ayesha bahut acha acting karte hain (kudos to them, fight seems very realistic and very few actors manage to do this).
Left on their own, they would have figured out their issues, Pakhi can't let that happen. She knows her being in the room will trigger Sai. I guess after shouting at them, Sai will leave the room and go to balcony where she will meet Tai.
Also noticed Pakhi is changing her tactic. She is dropping tumhari biwi from her dialogues and going to yeh ladki when she refers to Sai.
I am guessing actress playing role of Pakhi would have been given direction by the show makers not to accept the negative stance and stick to the delusions of Pakhi until she comes out openly as negative in the show via a monologue. But just like us, maybe even she is not convinced about Pakhi's delusions and therefore it doesn't sound convincing when she is giving the interviews.