Well, did she eat something green beforehand? Vomiting is pretty much inevitable if you exercise too hard, and vomit is colored by what you've eaten in the past hours to day. Blood comes up looking like tar or coffee grounds, and is only bright red when you're bleeding quickly and it doesn't have time to digest. Since hers is green, maybe it's gatorade?
Make sure she stays hydrated, and get her to eat a little something when the vomiting stops.
Sounds like the beginning of gall bladder disease. She may need a hydascan to determine if her gall bladder is working correctly. I hope she doesn't have much pain. Bile is a nasty tasting green acid-producing liquid made in the gall bladder to help digest food. - I used to get relief by drinking grapefruit juice to which a bit of cooking oil was added.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.