I am sorry that your daughter developed Atonic seizures. They are so worrisome because of the sudden hard falls. My son, now age 41, started having seizures at age 3. Up until that time, no delays or problems. After about 2 months of having a grand mal seizure every 2-3 weeks in spite of Phenobarb and then Dilantin, we took him to a pediatric neurologist at what was then called Children's Memorial Hospital (in Chicago, where we live). She put him on Tegretol and a few weeks later, he started having drop/Atonic seizures in addition to the grand mal seizures, which continued and became more frequent. He would drop backwards very suddenly while fully awake, as if he had been shoved hard. After a bad fall on concrete which required stitches, we got a helmet for him. The Atonic seizures continued (1-6 a day), but at least his head was protected. He was then hospitalized for several weeks in a fruitless attempt to uncover the underlying cause of all his seizures (which was never found). His EEGS had been normal, and while hospitalized he had quite a few. Suddenly the neurologist "saw something" on a new EEG and she abruptly yanked him off Tegretol and started Depakote instead. She told us that Tegretol was contraindicated with his type of seizures. Within a few months, the Atonic seizures tapered off and then stopped completely, and he has never had one since. He's been off Depakote for many years, and his seizures–except for the Atonics–have been when he is asleep. He still has an grand mal seizure about once a week, usually in the early morning hours. Medical Marijuana seemed to decrease the seizures.