My daughter recently had an Arnold-Chiari Malformation neurosurgery. The tonsils were 5ml into the spinal canal. She is having a difficult recovery and progressing, but slowly. She now has developed and in the hospital for throwing up and low hemoglobin. What causes the hemoglobin to become low; is it diet related? I know she lost about 14 lbs over last few weeks and is very tiny weighing in at 95 lbs. Any ideas of what questions we should ask or talk about. We are very concerned. She did not have much blood loss during surgery.