Seizure?

That does sound odd considering her age and that she's never had anything like that happen before. I've witnessed a seizure twice before. Once was years ago when I worked at a movie theater. In the snack bar line a child had a seizure. The second time was when I was working for a construction company. I worked in the office. I had only been there for about thirty minutes that morning when one of the installers came running into the office and asked me to come outside and look at something. When I got out there, there was another installer lying on the ground, eyes rolled back, and he was having a seizure. I screamed for someone to call 911. I later found out that the boy had had history of seizures and was on medication that he never took. It is a very scary thing to see. I hope all works out for your sister!

ya there are many sub-types of seizures some are very rare that few is known of their etiology. this could happen if she ever had a slight, minor injury or severe injury before that long been treated? this maybe a late complication of it.