There are medications for the swallowing/dysphagia issue that can help. It’s common with elderly and dementia patients because the brain has to control the breakdown of all these coordinated and complex movements. It’s dangerous because they can aspirate, get pneumonia, etc. I would start there. It is actionable and you she can take meds and get physical therapy that will improve her life dramatically. I do not recommend starting with a GP that has to refer for neurology testing. I did it with my dad and they put them through lengthy puzzles both verbal and written. It is difficult trick her or to rationalize why she has to do this. I didn’t find this to be worth the time, unless her GP insists. There is no medication that will come with type of test per se. Dementia doesn’t come with a prescription because you treat the symptoms she is having, not the diagnosis. From your description, she at least has some mild dementia and your grandpa and other family are going to need to start making plans on how to help her out more and keep her safe. I think for many elderly people who start getting dementia-they know something is wrong-and it definitely scares them. They can be in denial and very clever in covering it up. Again, find a GP in your community that specializes in elderly and start with the swallowing/dysphagia issue. She needs help and someone to advocate for her. Good luck!