This was a bit of a jump in her crazy levels in front of the MC. I suppose the nightmare is what happened minus the scar spreading, but I just psychotic breaks are very sudden. I just wish there was one more scene in between to get us to her.. stripping in the middle of the hall and losing her mind.
Also he was told anything he said wouldn't get through to her, so why did he expect it to work? You're expecting logic from a girl who showed she is not thinking logically..