BD, that's exactly what my DM had to have done, so you have my sympathies. PM me if you want to chat about it. I am also on the Elderly Parents thread where other posters have been enormously helpful - much easier to find stuff out from others who have been through the process.
It has taken about 6months to get the diagnosis of mixed dementia (both vascular and Alzheimers) but over that time she has got used to the carers, is on medication and things seem settled at the moment. She did find the diagnostic process hard and still has days when I call and she's cross about it, but overall it is better as we all know where we stand. I am sure there will be more difficult times ahead.
Herbs, I think you/siblings might have to be very assertive and get her to have carers who will do light cleaning and check food dates/help with bed-changing, etc. My DM finds an hour at a time is a good length of time - 2 hours was too much. We started with an hour twice a week, but we are reviewing it next month - not sure if I should make it 3 times.
And Cremo too. It sounds like you are pretty assertive with them already. Could you check out possible places to move to and take them on a visit too? Or have you already tried that.
It does help when you can blame stuff on "the doctors say that..." but I as an assertive type, I have been using my teacher-skills to get her to agree/see the necessity