I believe my grandmother is suffering from some form of dementia but its proving very difficult to get her to see her gp any advice please?

What types of signs are there? Is it risking her health and safety ?

Does she live alone ?

She's forgetting things and asking for her husband who passed away 18 years ago simple everyday tasks are difficult for her like eating or washing her whole personality has changed and she can also be quite aggressive yes she does live alone but me and my family go to her house everday to help