I'm thinking it's worse than it is.

[Burlea]

My Dm has been loosing weight over a few months, she is now down to 5st 4lb. The doctor has referred her to the memory clinic which has said they will keep an eye on her, as her memory is not very good, but not worrying for them.
To help her weight she is on foodlink drinks even though she is eating normally. Every day she has 3 reasonable meals. Cakes and chocolate as well. With doctors advice.
She feels dizzy occasionally especially when standing up, which they have put down to her loosing weight. Has been referred to have a CT scan after her bloods and x-rays have come back clear.

Tonight when we went she is getting very aggressive with me worse than normal.

Unfortunately tonight I mentioned that my Sil had died and we had a big conversation about her life. She then asked about Mil again a chat about how she is coping as she is 91.
I live about 30 minutes from mum, came home to get calls from my brothers to offer condolences about Mil dying. She had also phoned our DD who is a carer for Mil to say about Mil dying how sad she was. DD has then called in a panic while walking round to mils house. Phoned mum to explain again who had died and she said she knows it's my brothers and DD who have got it wrong.
Don't know what to do or say to her. It's the aggression and the lying that I'm finding difficult.
I'm starting to think she might have a problem with her brain.
Don't as usual know why I'm posting just want to tell.

I’m no expert but it certainly sounds like something is wrong

How old is she?

I might not be around till after Xmas but if you post on the main thread, there’s a lot of chat there.

Memory clinic is good starting point.
It’s really difficult when your relative is insistent that their version of reality is right and you’ve got it all wrong. Or that they become irritable and aggressive when previously they were tolerant.
Don’t argue or tell them they are lying. Just jot down the instances and the triggers to see if a pattern emerges. Her doctor- if you can get her there- might be able to see if she has an infection. Be as patient as you can. It’s hard.

To be honest, I'd put her in the car and take her to the GP or minor injuries clinic if you have one. It could be a UTI which can play havoc with memory and mental function, but it's easily treatable.

I'm sorry things are so worrying and hope you can manage a decent Christmas.