Hello, Dr. Fernando has opted out to attend to other matters. Low CO2 can just be from hyperventilation. The most common cause of high IgE is allergies. IgG is found in viral infections and in bacterial infections. I assume you mean RDW. Without the other blood test results it is meaningless.
Has she been checked for Epstein-Barr virus (mononucleosis). That would be one possible scenario.