Sorry for the late response to this - was in the Middle of Nowhere (aka the East Midlands
) without my laptop, so wasn't really checking TSR til we got back today.
Just wanna reemphasise that I'm pretty certain you can't be the sole cause of your sister's eating disorder. Also, you are right in what you say. Mental illness doesn't give anyone the right to be a jackass. It can make antisocial behaviour understandable and contextualise it, but it doesn't negate the fact that your sister is being horrible, if she's making your life difficult. By the sounds of it, not all of her behaviour is entirely caused by her illness? So that makes things unnecessarily hard on you
Also, if your sister won't let you talk to her about her problems, there's not much you can do. Especially when you're ill yourself. So try and be a bit kinder to yourself, yeah?
It's a really difficult situation to be in but
please don't take this all upon yourself and blame yourself for it. Keep reaching out to people and talking