The recurrence of seizures on reducing the dose of medication shows she will have to continue medication at the previous levels.It is well known that in some seizure syndromes like Juvenile Myoclonic Epilepsy
the chance of recurrence of seizures is high on tapering medications.
Since she is getting married and is likely to get pregnant..it is necessary to discuss the medication with the treating doctor.Sodium Valproate
or Valparin chrono should be avoided if seizures can be controlled with other antiepileptic drugs. But it is also important to remember that the drug which most effectively controls the seizures should be used.
Leveteracetam may be a reasonable choice if Sodium valproate is planned to be tapered.The change of medication should be made ideally before pregnancy
Your doctor will also advice you about the need for Folic acid
supplementation to prevent Neural tube defects in the fetus.Hope everything goes fine!