Is it possible that..?

is it possible that a demon can enter your body while in a coma? My friend just woke up from a coma like almost 2 weeks ago and shes been really evil lately. She said that everyone will stew in hell, she scratches her family members, she calls her own mother a ***** and insults everyone else like that. And she has no record of a psycopathic. So im just wondering if that could be her problem.