J.,
Having gone through this myself, I know how scary this must of been for you. In all the reserach I have done via the internet and talking with my doctor it suggests that febrile seizures are more common then we realize. Everything I have read suggests that they do not have any affect on the childs brain or other organs after the fact and that this is just the way our childs body reacts to a fever that spikes quickly.
My little one has had three in the first two years of his life, he is now 3. We are blessed that we have not seen one in a year or so. Although, I am diligent about giving him Motrin even at the slighest of fever. The last seizure he had he actually was able to tell me that he felt funny and needed me to pick him up.
The only suggestions that I have is to make sure that little one eats a wholesome diet, children's vitamin and to watch for those getting sick signs. (runny nose, pulling at the ears, etc). Should she have another seizure just remember to place her on her side on a carpeted floor and be sure nothing is in her mouth. Continue to talk to her during the seizure. The ER told me it was not necessary to call an ambulance but to just bring him in once his seizure was completed. I expalined to them that I would call the ambulance everytime and that the EMT's are better able to handle the situation then I and asked if they had ever tried to put a child in a car seat after a seizure.
I still worry about him having another seizure and keep a monitor in his room so that I may hear him, told his preschool teacher/school, family & friends, babysitter what to expect and do should it occur when I am not around. Our peditrician stated that the peek time is 8 months to five years. I hope some of this helps.