Bulimics will often visit pro-bulimia sites. Or make an Eating Disorder Myspace or Facebook. They will sometimes have Icons or Pictures of bulimic people or "thinsporational" quotes saved on the computer.
So check the computer. The pictures, and the site history.. where has your child been?
Beat bulimia using the 3 Techniques taught in my private online program and community
Just recently I emailed my friend and said "Funny (well, not really) how many psychologists, doctors, dieticians, support groups, hospitals, and even a hypnotist, I went to over the years that couldn’t help me – and all it took in the end was a simple site like this... - Cassie (Shared with permission)