Excellent thought– it feels like Zoom is quickly becoming the go-to for virtual meetings and hangouts these days. If you don't mind my asking, how computer literate is your mum?
If she is able to use a keyboard and read text, I would highly recommend these forums themselves as a bit of a social space to chat with people with similar problems. If she is very tech savvy, there are loads of online communities of people centered around pretty much every interest or hobby you can think of, if that's what you mean bit "similar circumstances."
Otherwise, if she is elderly, perhaps there are virtual social events put on by your local council or aged care facility?
Happy to help further!