I think Aditi will enter the show has some mentally depressed women (a la Mandira of Kyunki)after a fall from the cliff. Chet will see her in this condition and he will sympathise and feel sorry for her .Thats when Aditi will start trying to cause havoc in their married life. Later on he will come to know her true nature and that she was only pretending to be sick then he will kick her out of his life. Maybe at this point Aruna Irani may enter the show as a positive character and help Anupama overcome the crisis.
Let see what happens.