Hi, The one test that might be benefical is a Tilt Table Test. Your daughter might have a autonomic dysfunction(dysautonomia). There are a couple of other things. Look on the internet for, Neurocardiogenic Syncope. Seeing a cardio. Doctor who is familar with these conditions would be very helpfu. If you go to the NDRF.com site you will not only find a doctor in your area, but lots of information. Don't worry non of these disorders are life theartening.......unless its the long QT syndrome. Please find a good Cardio. Hope this Helps. BTW, The "Tilt Table Test" will reproduce your daughters symptoms and hopefully give you the answers you are looking for!