Is my grandma developing dementia/Alzheimer's?

Hello,
I am in an unpleasant situation right now because of the virus - I need some advice but I can't take my grandma to the doctor. I need to get some opinion on whether she's actually developing the above mentioned or if it's something else.

My grandpa passed away 1.5 years ago - they'd lived together at the same house for over 50 years. Grandma lives alone now. Some time after that she started saying that people from the TV are talking to her, waving. She asked if it's possible. In the beginning she was more skeptical but then she seemed to have accepted it. She also started having some trouble using the mobile phones but nothing too bad. I thought it was probably because she was never good with technology and she doesn't know how it works.

However, in the past 1-2 months things are taking a more dire turn. She started saying that the neighbours are going in her house in the middle of the night and are trying to sell it but her story makes no logical sense. She also sensed a strong smell after a night when she thought they were there - like sweat, filthy people. She washed everything the next day. Then she said she saw the prime minister leaving the house one day but she couldn't even say where she saw him. A week later she said maybe she saw him on TV but because it has a big screen and it seemed like he was actually there. She continued with a story about another politician who was talking to her only and giving her signs from the TV to change the channel.

Finally, she also said that a couple of days ago she saw herself in the... first she said "mirror" then "TV", and she thought it was someone else so she started to tell that person about her day and the past months - like that she went to the dentist. At some point she realised it was her reflection. She found the story amusing. Me - not so much.

All of these things she says with a smile. I would freak out if I thought someone was in my place, but her tone was like it wasn't such a big deal. I wonder if it counts as a change of personality - she just doesn't seem that bothered with things anymore but at the same time I know she's really worried and stressed out because she thinks the neighbours are out to get her.

She says she's sleeping but that she also wakes up a few times a night and she gets up to check if other people are in the house.

As far as I know, she doesn't have problems with her daily activities - she does the laundry by hand every day, she goes to the store, etc. Her memory seems fine.

The only other thing is that she says she sometimes gets electrical shocks - the first time was bad, she said something pushed her very hard and she fell and lost consciousness and the ability to move for a while (it's possible she hit her head). For at least a week afterwards she said she was getting dizzy when lying down or getting up from bed. The other "shocks" were small ones, on her hands and feet, one time feeling as if something's crawling in her head but couldn't get it. Other than the TV, the other problems started after that incident where she fell. I learned much later and no one took her to the doctor... and now I can't even get to her, let alone take her somewhere.

Any information or opinion might be helpful, I read a lot but she doesn't really seem to match anything.