What Is The Recovery Process On Being In Induced Coma State After Teeth Removal?

My Neighbors grandson's friend for 15 yrs had her teeth pulled on Thursday last week felt really bad afterwards is now in ICU at HELIFAX In medical induced coma. She's cold from the waist down and both sides of her brain have turned to mush(dead)the only thing that is working is her back or breathing, brain stem area.They have ran a couple of test to try and find out what happened but no results yet. please tell me any information that you can I would appreciate it. Thank You so Much for your time.