My girlfriend has bulimia and i dont know wat to do...

I just found out today my girlfriend has bulimia. She told me after i had visit her for the weekend. I couldn't get my head around at first but i love her so much that i just wanna do nothin but help her!! Shes afraid to tell anyone and feels like it is a very dark burden which really worries me. She hasnt told her parents cuz shes too shameful of it and only told me cuz were so close that we love each other and trust each other. I really wanna help her but she tinks its gonna push me away but i know it wont, she wants to help change herslf and get rid of it, but doesnt want me to help cuz she feels like i'll sufficate her and wants to take the first step by herself which i understand.But i really want help i dont know wat to do!! SO can anyone please help me, our relationship kinda hangs in the balance and i love this girl so much i cant lose her especially to this!!