My heart goes out to you, I have stood in your shoes with my Dad and know how it feels, bewildering and almost surreal, you can't believe it's happening.........my Dad also went to an assessment centre and was sectioned, it opened up a world or horrors for us, leaving him there looking so lost, we watched him walk up and down corridors holding hands with complete strangers, crawling on the floor and smoking imaginary cigarettes, we were phoned to say he had been aggressive and hit a nurse (my Dad was the most quiet, kindest man ever, never aggressive)
We went through so many medications, aricept didn't help, he was given anti psychotics , diazepam, so many different ones.........in the end I asked for them to try ebixa (mementine) and for my Dad this was the magic pill, it was like a light had been turned back on, instead of not knowing where the end of his nose was he was waiting for me at the door to take him home.........it allowed us to have Dad back for 12 months before he declined further and the meds simply stopped working but I know that when I was in your position 12 months of getting back to some normality was a gift..........I have no idea if this or one of the other drugs will work for your Mum but it's worth discussing with her consultant, let me know how you get on.thinking of you x