Those pendants are not usually much use for anyone with dementia since they will a) forget to wear it, or b) hide it, or c) forget what it’s for and what to do with it, even if they do wear it.
As pps have said, routine is very important with dementia, so best to stick as far as possible with the familiar.
One ploy I’ve heard of, with people who are very reluctant to have a cleaner in, is to say, ‘X really needs a little job, so you’d be doing her a favour.’
Or, if the cost is what they object to (and your own funds permit) say, Oh, it’s free from the government now, once you’re over x age.
When filling in the form for claiming Attendance Allowance, it’s important to state how things are on the worst day/night, don’t gloss over anything. Or get someone from Age U.K. to help you fill it in - they are very helpful.
Please do get Powers of Attorney for both Finances and Health and Welfare sorted out ASAP, if they’re not done already. Can save monumental headaches later. People with dementia can become very suspicious of your motives, and think you’re just after their money, so vital to do it before this stage.
One more thing, do make plenty of copies of keys! Once a person has dementia they are very apt to be lost, thrown away, or hidden so successfully that they never see the light of day again. (Can you tell I’m speaking from experience here?)