Advice for a Friend of an Eating Disorder Sufferer

My recent video in response to the viewer question:"My best friend suffers from an eating disorder and I've tried so hard to help her, I've supported her, encouraged her, got information for her, gone to appointments with her, but nothing helps. I know I can't save her. I know I can't force her to get better. But I just wondered if there is anything else I can do to help her and how I am supposed