Suggestions:
1) Stop wasting money on a vet. If you feel the need to spend money, donate it to a charity of your choice.
2) Check your humidity. If you are having constant bad sheds and stuck eye caps - it's because your humidity is too low. If you are using a hygrometer - check it. Here is a quick and easy test (follow the link) http://www.wikihow.com/Test-a-Hygrometer
3) Check the heat. Do you have the proper floor and ambient temperatures? If you have a digital or analog thermometer - check them. I'd also recommend a laser heat gun for double and triple checking regularly.
4) Relax. Ball Pythons commonly go off of food for up to a year. I realize that this can be stressful, but after millions of years of evolution their bodies are more than capable of maintaining health without food. However, evolution doesn't prepare them for a human bothering them. So, leave her alone. Stop handling her and let her do what instinct is telling her to do. She will eat when she is ready.