A diagnosis is not the only consideration. A person with a diagnosis may have few problems or lots. And your DM may have problems apart from Alzheimer’s. I have successfully completed many AA claims. Here are my tips. When the forms asks about needs, think difficulties. A person might say they don’t have a need. They manage. What needs to be written in the form is exactly how they manage. Whether it is with help, with aids or by doing things differently.
Never say subjective words like sometimes, occasionally, often. They like specifics e.g. 3 times a month, taking 30 mins each time.
Don’t be brave or underplay anything. Describe in detail a bad day
Just because a person can manage, don’t disregard it e.g. getting out of bed I put 1 hand on the edge of the bed and wriggle to the edge. I then use both hands to push myself to be sitting on the side of the bed. I wait for 5 mins until pain subsides/I stop feeling dizzy/feel strong enough. Then I lean in a bedside table and push myself to a standing position. I wait until I feel strong enough to move away. From first waking up to moving away takes 10 mins.
Vulnerable is a good word. And frail. Also what are the risks to the person currently. Consider memory, do they need encouraging to take medication or food. Is there any element of self neglect. Communication could be a big problem. Can they read, understand and reply to letters/forms. Can they deal with telephone calls. Who gets their medication from the doctor.
Examples of previous problems or behaviours complete with consequences will be useful. I used to write down how the customer was answering the questions. Whether they struggled to give the answers, whether they were distressed, emotional.
Back to physical problems. You will see that all elements of personal care are covered separately. So in the toilet part, give a number of times they go to the toilet plus how they would get to and use the toilet. Any accidents. Any extra bathing. How long it would take until they were back in their chair. In fact I would remind them of the problems getting out of a chair. Getting out of a chair is key, because of how many times they do it. Describe in detail how they do it. So if they go to the toilet 10 times between getting out of bed and going to bed at night and each time takes 10 mins, they will use the total time - 100 mins towards their decision.
It will take a long time to complete the form. Good luck.