It seems like you have quite a few family members. Morally, you should all work together to help your sister. Takes shifts in who looks out for her. At least until you can find a more permanent solution. It wouldn't be moral to leave your sister to the "wolves" but it also wouldn't be moral to place the burden of her responsibility on to one person's shoulders.

Good luck.

I've read a few arguments in favor of the argument that social media is bad for your mental health, and I don't disagree with them, but I've always wondered that since social is just an extension of society, doesn't that mean society is bad for your mental health? I mean, sure social media can present everything through rose-tinted glasses, but Im able to remember a time when social media wasn't a thing. Folks still had the same kind of problems they have today. And you couldn't just exit out of life, like you can exit out of a website (I know there's a lot of baggage that would come along with not having social media, but if it's harming you, you gotta do what's best for you) .