I have a Kindle and a Kobo and I prefer the Kindle. Neither is easier to use than the other. It's simply a matter of personal preference. They're both excellent devices.
If you really want an android device, though, I'd consider a tablet. I personally read on my phone a lot but my eyesight is pretty good for my age. I just turned 80.
A good choice of tablet is a Samsung Galaxy Tab A 8". Or, if you want to save some money, an 8" Fire tablet. Either one can be used with ebooks from any source. Or, if her eyesight is okay, she might try her smartphone.
Barry
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