Board Thread:Legitimate Canon Questions/@comment-50.158.182.216-20140115022549/@comment-4091815-20140115024421

Officially - Erica is dead.

The actor, Gage Golightly, returned for a brief cameo in Season 3 but is officially no longer associated with the show.

So to answer your question, anything can happen in a supernatural show - but it's not likely in this case.