I feel like there could be her parents depending on her financially or something because she literally went to her roommate account to say "oh i just lost 15k on something". Yeah, it sucks losing 15k, but given how many viewers she has, getting back 15k doesn't seem to be a fuck ton of work as long as she has a steady stream of donos and people buying vps. Maria, that pink-haired girl in Iluna, drops covers every month-ish and costs around 5-10k if I remember correctly so we know she makes enough money throughout her streaming and stuff to drop covers often enough, meaning Selen should also have enough to get back that 15k.
But the fact that her roommate tweet sounded like it was "I need that money back soon-ish" makes me think there's some shady shit going on with her parents. Part of me thinks its that asian "we raised you so you better give us respect by giving us things in return for raising you" type of bullshit.