What I'm about to pen down below, maybe more of what events I would like for to occur more than what may happen, but anyways, I feel the positive energy that vibrated in Thursday's episode, will carry on in Monday's episode, so:
*I think Heer will peak outside from the window and see poor Prem being drenched in the rain, loneliness and pain clearly etched in his eyes. Heer will take an umbrella and go outside. First, she'll hesitate, not sure whether to proceed or not. Then, she'll come forward and hesitantly, ask Prem to come inside or else he'll get sick. Prem will deny and tell her to go away. Then what may follow, is Heer sitting next to him, and thanking him for what he did for her, for saving her from marrying Prashant/Manmeet. She'll also empathize with how Prem's feeling, because she too relates to the feeling of loneliness and being seperated from her family. (I would love for a confession of Heer's identity and her love for Prem, but then I just don't think it'll occur so soon).
*Meher might see them like this and vow to get them together. So she may plan little incidents of getting them together, especially for Heer, to get out of her that she indeed loves Prem as much as he loves her.
*Like someone else said, I also think Preet will come to the house and urge Prem to come back home. Prem will ofcourse refuse, and Preet may insist in living with his Prem Bhaiya too, but ofcourse Prem will refuse citing his father can't lose both his sons and he needs Preet to be with him now.
*In the next half, I think DJ will rub salt on Lalit's wounds, and broadcast, how her daughter's life is ruined, how nobody may marry her and how humiliated her family is. I think then, Lalit may ask one of his sons, Preet/Harman to marry Ash. Or something on those lines, as I don't think DJ will sit still after the evil look she delivered at the end of Thursday's episode.
Keep smiling..
Love
Soni