I am extremely anxious and worried right now. 😔

I just accidentally glanced at a notebook packing to go back home from our trip and realized it was my 13 year old daughter’s diary instead. It mentioned from a couple months ago that she thinks that she has an eating disorder, bulimia and that she throws up every day after dinner. I am very concerned. Any advice please on how to handle this situation? I do not want to let her know that I saw her diary but I want to help her with her eating disorder. Please, what do I do?