Blood disappearing?! Serious question.?

Sounds like severe anemia. If she is not physically losing the blood, she can't be "losing" it any other way. Her body is having difficulty producing hemoglobin, a molecule in her red blood cells which carries oxygen to her brain. However, anemia can also be caused by a lack of iron in her blood. Blood transfusions are only necessary if vitamins and medication can't do the job. Hope she feels better!