Making friends via gaming

Hi, my daughter (21) would like to make friends with people with similar interests via gaming. She is on a 2 year break from university due to severe anxiety, agoraphobia and feels isolated but at the same time finds social interaction exhausting. She is really getting into pc gaming using games from Steam, but also has ps4. I was trying to do a bit of research for her to find best ways. I found something called Discord sites but I couldn't work out how to make sure it's a friendly site. My daughter is pretty savvy about keeping herself safe online so wouldn't be in danger of exploitation. However, she would find it upsetting if someone she felt she'd started to make a connection with turned out to be not very nice. She's stopped playing ps4 games online because of in game behaviour of a few people. She does find it hard to trust people now. She finds it easier to connect with people if there is a shared interest. Does anyone have any suggestions of appropriate ways to connect via gaming?

Thanks