Question about a pt I had with burns

Hello! I helped care for a patient this week in clinicals, and she had second degree burns over on her arms and scalp, roughly 6% TBSA. She was involved in a house fire, and was burned trying to save a loved one, in which she was unsuccessful. I saw her the first day (one day post burns), and she seemed very flat, but we could get an occasional smile out of her. I put her with an awesome student nurse, because I thought the SN really has the personality to help her heal mentally (or at least get her on the track to healing). I came in the next morning to get report from the charge nurse (I was team leader for two students, two RN's, and 8 patients this week...we're doing leadership clinicals). The leaving CN reported she went psychotic during the night. Trying to climb over bed rails, refusing treatments, and combative. They were able to sedate her with 5mg haldol, and had orders for restraints if needed. I also found out then she has a significant psychiatric history, and was released last week from a mental health care facility (reason for admission then is unknown to me).
Ok, now to the questions! Is this a common thing you've seen with post-traumatic injuries? How do you handle it if it occurs?
Thanks in advance for your comments! -Andrea

PS- There have been several structure fires in the region lately, and tried to research this particular event, and was unable to find info on it, but did find info on other fires. Please do not assume you know who I am talking about... So sad that this is happening so frequently lately.