You are right. Is a hitherto episode of epilepsy a good defence for dangerous driving in general?

I guess it could come down to whether or not the person has previous incidents of dangerous driving or they have footage or other evidence to suggest she wasn’t epileptic. If there’s no physical evidence or subsequent seizures. (I know I’m speculating and - you are right - we should assume innocence and that her account is right until shown not to be).