Gastroparesis? Delayed emptying? What next?

Our 18 year old daughter is a recovered(ing) anorexic.  Never a bulimic.  Shortly after getting 'healthy', she developed this problem with certain foods.  She will eat, and shortly thereafter, within moments/minutes the food will come right back up in her mouth.  It is particularly troublesome with:  pasta, lettuce/some vegetables, ice cream, etc.  

She has had gastric emptying studies; scopes; etc.  She shows some delayed emptying; some possibel gastroparesis.  I am at my wits end. It greatly affects her 'social' life.  She either spits (if she can) or reswallows (a few times).  

We have seen three different gastro doctors; including a research doctor.  He is puzzled.  He said today it could have now become a habit.  He now wants to try domperidone.  I am thinking trying a nutritionist along with some biofeedback...etc.  Any thoughts?

[boron]

Biofeedback is one to consider, yes, since it can maybe show is it psychological or not.

Before that, she can have a 2 day low-fructose diet trial. She needs to exclude all
- fructose: fruits and any fruit product, and any food containing high fructose corn syrup,
- sorbitol: soft drinks, "low sugar" chewing gum, any "low calorie" food, and
- fructans: wheat, onions, leeks, asparagus and artichokes

For more details find a link in my journals.