It's usually recommended that you get help in filling in the AA form so that you highlight areas of dependence on others to maintain independent living. Perhaps an advisor from AgeUK or Alzheimer's Society, or CAB, or a friend who's got experience.
You could start with the Bristol Activities of Daily Living checklist:
http://www.health.fgov.be/internet2...acutecare/documents/ie2divers/19073273_nl.pdf
From what you say, your mum needs you to 'attend' to help with a number of aspects of Daily Living. Remember that the situation is progressive. Think about how she coped a year ago, 6 months ago, etc. and see which areas are obviously deteriorating. You may need to gild the lily a bit on the form.
For example, if there have been occasions where she forgets appointments, or leaves meals to fester in the fridge, or wears the same clothes for several days, you would note on the form that she does this regularly or usually, even if at the moment these have been occasional lapses.
There is a useful maxim "a managed need is still a need." What happens, or would happen, if you don't go and see her daily? If she is like my MIL was when I was doing daily care visits, things will unravel quite fast without your intervention. This is why she should qualify for lower level AA which concerns daytime support.