There are many reasons for having stomach complaints. Usually bleeding is noticed in the vomitus by a term called "coffee ground emesis". This is characterized by vomit that is dark in color with the same consistency as coffee grounds. If the bleeding is fresh, it will be red in color. Bleeding further down the digestive track is visible in stools as being black (as in tar). Also, any bleeding can be microscopic and not detectable to the naked eye.
In any case, your daughter's gastritis
) should be evaluated by her family physician.