i'm not sure talk to a doctor. but vomiting does get rid of all your vital fluids and dehydrates you so it's a good idea to try and keep down some fluids. if they start vomiting up blood then there's probably a big problem i think it could mean there is an ulcer or cancer but am not certain.
take her to the doctor!
Go the aussies! stosur!!!
and good luck russians: dementieva, safina, kirilenko, sharapova, kuznetsova, bovina, zvonareva, dushevina.
also good luck to: azarenka, lucic, sprem, vakulenko, vaidisova, safarova, ivanovic, groenefeld, mirza, krajicek, kvitkova, larcher de brito, lisicki.