I just wanted you to know I'm thinking of you and your gf and her daughter. This is **** for all of you. My former husband had a psychotic break due to too many steroids that doctors administered over a 3 day period for a bad allergic reaction. It was frightening and I finally called an ambulance. He was in the hospital for several days and the first night took apart the heart monitor to see if a heart was in there. He had to be restrained. That is nowhere near as severe as your gf but it was overwhelming and frightful.
Please remember to take care of you and try to be gentle with yourself. You sound like a really good person. Best wishes.