Reddit reviews Talking to Eating Disorders: Simple Ways to Support Someone With Anorexia, Bulimia, Binge Eating, Or Body Ima ge Issues

I'm really sorry to hear that your sister is struggling with disordered eating.
Sounds like she's in a period where she recognizes that she has a problem but is still trying to manage it on her own. For me, personally, it was the most hopeless part of my ED, and I would've been super happy to have someone to vent to and talk about my behaviors. I think it's a huge showing of trust that she's willing to talk to you about it, because ED thrives in secrecy and guilt for using behaviors. My treatment team recommended this book to my family, and it helped them understand what I was going through and how they could be most supportive. It might be worth looking into.

I would really, really urge her to continue seeking medical care. It sometimes takes a long time to find the right therapist and dietician, but having a treatment team is critical to recovering from an eating disorder. EDs are usually comorbid with other issues such as anxiety and depression, and seeing a therapist helps to sort out those issues without resorting to ED behaviors as a coping mechanism. With the right treatment team, seeing a therapist and dietician really is invaluable. I can't stress it enough.

Overall, just continue to be there for her. I can tell by your post that you care a lot, and I think sometimes just having someone who can listen and understand makes a big difference. I wish both of you the best of luck.