If it isn't something with her liver, she definitely has an intestinal/digestive issue. They are very hard to diagnose. I would get her on a probiotic and then consult with a speciality and a nutritionist. There has to be comething she will eat. A quality low or non-fat yogurt (like Stoneyfield Organic) can also be tried.
You can also use baby food - even the meats as long as their isn't onions or lots of garlic in them (but not the little vienna sausages). Baby food veggies are also a good option.
Here is a link to Susan Davis, a nutritionist that several of us have consulted with and had great results.....
Pet Health Pet Nutritionist Holistic Pet