Vitamin drops are not going to help with a seizure.
What is the temperature where your chin is? Was she out for play time? What kind of treats do you give and how often? What was she doing immediately before the seizure? How do you know it was a seizure?
Again, as you were told in another thread, you are near good breeders there in Michigan. They would happily sell you food, I'm sure, so that you didn't have to use pet store crap. Sometimes you can get good food at pet stores, but not many of them carry it. Oxbow and Mazuri are the only ones you can get in pet stores, and it's only the large chains.