After showing how much Aabha prayed for Karan's safety they can't show him being killed as that would mean that no matter how much we pray, if evil people want to harm us, the harm will be done.
I think in the fight tomorrow, Karan will beep Aabha by mistake. Aabha will become worried and will try go searching for him.
Karan will get distracted with his phone ringing and maasi will take that moment to try and kill him. The phone call will be from Ranchod and he will hear about how he is connected to Swarn Bhavan and Jaggu and all. He will also hear Karan say that nothing will happen to his mother as Aabha is there. In all this he will be brought near the edge of the cliff. And he will fall down. Maasi will think he is dead and will laugh.
Abha will be frantically looking for Karan and then reaches the place. Maasi will be there and will tell her that Karan is dead. Aabha will go crazy.
Now I don't know how Ranchod will enter the scene. But basically I think, Aabha will go back in normal clothes as she doesn't believe Karan is dead. maasi will tell the whole family that Karan is dead. And will show her true colours (hence the party will be thrown). Pratibha will be hit on her head by the kidnapper by mistake and will become normal again and will escape. She will reach the day of the party and like aabha she too will not believe that karan is dead.
Then Ranchod will enter the scene.
In the meantime, I feel either Ranchod has saved karan and they conspire to expose Maasi and also get back Swarn bhavan. OR Karan is in a really bad shape after being rescued and Ranchod has come to take the right of Swarnbhavan. And while he helps Aabha deal with maasi, karan will make his comeback.
I really feel that from the story told today at the temple, Aabha will ask for Karan to be given back to her (hence he can't be dead but will not be found and hence people think he is dead)