You need to get your daughter examined to rule out a few things such as low blood pressure, postural hypotension, cervical spinal nerve compression,
hypoglycemia, severe anemia, an underactive thyroid (called hypothyroidism), overactive thyroid (called hyperthyroidism), adrenal insufficiency (called Addison's disease), GERD, and internal ear infections. Polycystic ovarian disease is another cause. Certain types of epilepsies and seizures too can cause similar symptoms.