There is a lot of misinformation about seizures and epilepsy on this thread. There are lots of different kinds of seizures- focal seizures, abscence seizures, generalised tonic clonic seizures (the type that most of people think of when they think of a seizure). You react differently post-ictally depending on the type of seizure.
Sometimes epilepsy can only be seen on an EEG when a seizure actually occurs during the EEG, sometimes inter-ictal (between seizure) EEGs can pick up abnormal brain patterns that suggest the person has epilepsy.
Epilepsy can occur at any age. Sometimes there is an underlying neurological cause, eg brain tumour, neurological disorder eg brain damage, but often there is no known cause.
It’s a huge tragedy for the families, and if it is correct that she suffered a first seizure whilst driving it is the right decision not to prosecute her, but I can imagine it’s a difficult decision to accept if it’s your own child. Awful all round.