The only claim I've seen that she was bulemic was that she drank about 15 glasses of tea a day. It really didn't address how much she ate and what she ate.
There is proof though that she didn't have heart problems as a result of anything. She didn't have the enzymes that would indicate a heart attack. She didn't have heart damage. That was proven in 1990 by the medical teams taking care of her in the hospital using standard tests.
Terri had cardiac arrest in 1990. That IS well sourced and documented.
What isn't well documented is that she had a heart attack because no one (except her parents) tries to allege she did.