I think the first clue was the bus ticket that Shanky found. The first deal is to figure out that Sheila Mami is the reason for Geeta's performance. From there, they can take it one step further.
I completely agree with Pooja, Panku is doing all the work, but she won't get far if it's only her. Reason being, no one will support only her. If Adi is with her, she'll gain a better support and not get verbally abused so much. So before anything, her first step is to get Adi on her side which is proving tough.
But I think they may go back to Kullu, or the Kullu wala will come back or something as GM Mama tweeted that he's back in PKDH. That can only mean one thing.. Dhamaka.