Parents often try to wake up their children when they are having night terrors to try to comfort them. Actually, the best thing to do is try to keep your daughter asleep. If she isn't awakened, she will go back to a normal sleeping pattern at the end of the episode. Try to keep her safe during thrashing episodes by moving away objects that she might knock over.
Night terrors eventually go away without any treatment at all, but the hard part is waiting for that time to come. Some doctors have tried using medicines to try to treat night terrors, but for the most part, they are not helpful and usually not recommended. Try to be patient and talk with your pediatrician for more reassurance and education about night terrors.