I'm in almost this exact same situation! My grandma has Fuchs' Dystrophy and was an avid reader until about a decade ago when she stopped being able to see. We used a library program for a while but now that I'm living with her (since moving home from school during COVID), I have downloaded an app called "Libby," on my phone. It's free through your library, and I play audiobooks for her on a portable speaker. This one:
$1 My parents also have an Alexa speaker so I'm going to experiment with using Libby via Alexa in the hopes that she will be able to do it all herself. She doesn't have an iPhone so at the moment I am doing most of the setting it up for her.... I just got on this community today for some ideas on how to make her life more enjoyable/how she could be more independent. I like the idea of Libby because she can listen to samples first and doesn't need to visit a physical library. But will be looking into
$1 at another commenter's suggestion!