In the UK: no behavioral test for Dementia! Is it the same in the US?

I was told by a family friend that there is no behavioral test for Dementia. Oh they have the memory and math tests; the classic “clock” test; the brain scans; but there is no official troubleshoot for Dementia based on behavior.

My question is – is there a test in the US?

Bearing in mind – she is also Schizophrenic and pre-diabetic, these are the following behavioral “anomalies”

1) She is constantly wanting to go somewhere; to where – she does not know. I caught her pacing back and forth to a bus-stand outside our house on Sat 27th of April at around 5 pm. She then got a taxi, but 15 mins later – was back home. She’s restless and can’t seem to realize her behavior is strange. The police know her now and her escapades have been logged. This morning, she was dressed to go out, but said she decided not to.

2) She’s been constantly queering her bank for its working out of her interest figures. She’s been in touch with the banking ombudsman and has quizzed the local Lloyds bank manager on how the interest figures are worked out. She also accuses me of trying to manipulate her money. She keeps taking out money, £100 cash, from the cash machines; she says it’s for her taxi fares. On the 10th of May – she withdrew some amount – only to re-deposit it back in. This was noticed by one of the bank staff who is a friend of the family.

3) She’ impulsive. She can get an idea and expects it can be carried out immediately. This affects her preaching as a Jehovah’s Witness – since she’s expecting her calls to apply for baptism on spec. The local elders forbade her now, since she is not carrying out the preaching work correctly because of her inability to judge disinterest.

4) She’s spending time in her room with the door shut. I was able to peep in on what she does in there. It seems she’s just standing on one spot with eyes closed and embracing herself. She has a poor sense of time and this can go on for hours. She even bars her door. The Police had come out once – when I was concerned that she had barred herself in and was not responding to my calls.

5) She has to be reminded to eat; unless I prompt her to eat breakfast or lunch – she will not eat. Then at night when she’s really hungry – she’ll get up and eat cake or biscuits.

6) She keeps complaining of losing her wallet, mobile phone, house keys, phone/iPad charger and little bits and pieces. She then finds them again – as she had stashed the item in a bag in her room. We all do similar forgetful things – but I know now to ignore her when she says she’s lost her keys or wallet – because it will turn up eventually.

7) Hoards fruit, cakes and sweets in her bag. Perhaps it’s in anticipation of her sugar levels, but it seems too much to keep such things in suitcases.

8) She insists on selling her stamp/coin collection; she thinks she can make money out of it. The stamp/coin collection expert at Corbitts – Mosley St.; Newcastle upon Tyne – says they are mostly standard coins and the stamps she has are nice, but they are not of great value. Her collection is good – but not worth much. Still – she wants another firm to price the stamps.

9) She is using the F-word now. She never use to. She telling her voices to F-off!

10) Has developed a habit of listening to JW audio and video material – in various languages – that she does not even understand. She says she’s learning the language. She thinks she can process the language despite the language barrier.

Can these be simply attributed to Schizophrenia? She’s been schizophrenic since I’ve known her; she’s not done these “crazies” to be noticeable to me before 2018. Is this simply old age?