She died and by mistake Doctors gave her body to Prem.
After few days she will reagin conscious and ask for Prem. Later, doctors will call Prerna and Mukti will re-enter the show as Mukti.
This is only my thoughts.
No idea what Ekta is gonna do.
I have started to watch the show only for Mukti and Prem.
So, Ekta cannot do this to me.