Thanks Witzend - sometimes, when she comes out with an accusation, or relates a recent event that has never happened, straight away I can latch onto where it stems from - other times it either takes a lot of thinking through before it hits me, or I can't work it out at all. I think you are right in that something she has seen or heard is generally the trigger, though.
I think now that what we thought (hoped) was the initial effect of the meds was more down the her exhausted state at the time of taking it
We had another bad day yesterday - I thought she was showing all the signs at 8 a.m. yesterday morning, and warned hubby before I went to work. By 1pm, she was in full flow, apparently, and managed to get to the phone whilst he was in the bathroom - another police visit, as she rang them and reported that her son was holding her prisoner, so he could take her money. She just kept getting higher and higher, and after Hubby checked with GP for advice, he gave her the lorazepan at 3pm - but she wouldn't take it till he phoned me and I could tell her it was safe! It seemed poor hubs was again the 'bad guy' yesterday, so I left work early to give a hand. I can't say she was exactly 'nice' to me, though she was far more responsive to anything I said, but even so, it took till 9.30 last night before she 'came out of it' - again, apologies, ashamed and upset, lots of reassurance needed - then 20 minutes later, she had relegated the day to the status of a funny story, and found the whole thing quite amusing. She toddled off to bed, quite happy at around 10pm, and we've had a peaceful night - thankfully.
The house is now like Fort Knox, and its getting to be a habit to unplug the phone and hide it, as soon as we see any indication that she is about to 'Do a Jeckyll and Hyde', as my son succinctly phrased it, or before we go to bed.
If this med hasn't worked, then I don't have a clue where we go from here