The scenes being shot are in nightclubs and so, all the actors have to shoot from 4 pm to 6 am local time everyday. This continuous night shift is not agreeing with Kat's health.
And the fact that she took two days off to shoot in Abu Dhabi for an advertisement has worsened the situation.
Kat plays a hippie-like vivacious character in the film. Zoya's film also stars Hrithik Roshan, Abhay Deol, Farhan Akhtar and Kalki Koechlin.