My POV
Malini shows imlie that her daughter is ill n needs some surgery most probably a transplant.. something related to bone marrow maybe
Aryan comes to know that Malini is faking it n little miss cannot recover even after the transplant or Little Miss doesn't have any such illness which needs surgery.. Malini wants to kill imlie in real.. Imlie doesn't understand this and think Aryan is doing this because he doesn't like aditiya so how will he has feeling for the child...
At the last moment imlie discovers the truth about little miss, when imlie is all set for the transplant..so here is what will be kept secret from viewers..
The doctor will tell everyone that imlie miscarried in saving little miss n this will create misunderstanding between arylie..but in real imlie ask doctor to say so ...so that she can save herself from Malini trap..This time Aryan won't listen to imlie when she will come to tell him about her plan..rather out of anger he will blame imlie for the loss of their cheeku due Aditya child n might even say that imlie has chosen Aditya child n she doesn't love him (Aryan)...this will make imlie leave him n shift to PD.. hence the separation..
Malini already doesn't care about little miss as shown.. little miss could either die in the hospital or maybe is shown kidnapped... since CVs want to show confusions about cheeku's identity...n hence leap..
After leap when cheeku will meet Aryan.. she might call him by the same name that imlie used to call to create a connection between the two..n hence Cheeku will turn out to be arylie kid..
My theory if they r play parents tu they play Apne bache k parents y playing parents of an adopted kid 😂😂