What does your mom like to read?
I co-run a monthly book club that discusses sci fi and fantasy books. If that might be of interest to her, send me a message in chat. We've had the book club on Zoom for a year and a half, so it doesn't matter where attendees are located as long as the time zone isn't a problem.
We're a blindness-friendly group because, well, we're a friendly group. Friends of mine who are blind have joined meetings before. They're younger folks used to juggling lots of tech, but I can help your mom get set up. Since the meetings run on my Zoom account, I could also have a preliminary call with you and/or your mom to make sure she's comfortable with using Zoom.
If sci fi and/or fantasy aren't of interest, then
$1 is a good place to find book clubs. That's where we maintain our group maintains its online presence.