[Latte]

Many communities offer things like support groups, especially for young people with EDs. Perhaps you can refer her there to be part of group that would help her recover.

Letting her vent and creating a safe space in your friendship where she can be honest and vulnerable is amazing. Not all people have that, so continue to nurture that, but remember that you're not a therapist or other person who can necessarily provide the tools to help heal something as complex as an eating disorder, so along with a support group, something like a therapist or nutritionist specializing in bulimia would be awesome.