My husband has dementia and I have been his carer for about 10 years. We have moved house to be nearer our son and his family, and I have very few friends here, and have had to cancel many holidays and outings in the last few years because of my husband's ill health. Consequently I take refuge in reading, and can recommend the following.
I have come across an American writer called Elin Hilderbrand who writes very good books set on the island of Nantucket. They are basically romances, but a little more than that. Although I am a lifelong reader of much more intellectual books, I now find that Hilderbrand's books are really uplifting and perfect escapes. I read on my phone as a rule, and use Apple books, which are slightly cheaper than Kindle.
If your friend has difficulty concentrating and finds printed books a little heavy to hold, I can really recommend the way I read.