Dilshad said, agar izzat ki buniyad itni kachi hai toh..." but yahan toh izzat ki buniyad hi jhooth hai! Hollow structures are whitewashed here to give an impression of spotless appearance... and since there's no substance.. this "deewar" is bound to crumble.
Dilshad is staying true to being a lioness... fiercely protecting and defending her cubs and her territory now that she's taken her stand and decision.
But there's also the fact that Zoya is her primary target and shall always be. Targeting Zoya, was she just trying to insult Khans and throw them out... she has realized by now that Zoya is becoming Dilshad's strength and is Asad's weakness but Zoya is also her arch enemy. What better way to uproot Zoya from SM than maligning her image and making Gaffur all the more bitter about her.