With her advanced age and the Covid that is out there , it sounds like an impossible wish to fulfil. People over 70 that get the virus seem to have little chance of survival. Hopefully , her family might find out about your situation and be able to help you. If by chance , you have old pictures of her family and visits , you can put them up where she can see them all the time. I found many of my dementia patients found great comfort in viewing old photos and talking about the past. Wish you the best of luck.