Really quick... Could be...
Off the top of my head... you'd think they'd have ruled that out, wouldn't you? But you never know...
One way I can think of, is that the dental signs of bulimia are different - it's a smoothness from enamel erosion that looks different from enamel defects you see from poor absorption.
I also tend to think Terri was such a stressed out perfectionist... it fits with the bulimia. : / But that's purely speculation.
Probably because it makes me sad to think of her being abused.