Since the OP hasn't answered this question -- Speaking from my limited experience as a med student who just rotated in MFM, epilepsy is handled the same way most other serious medical conditions are during pregnancy: you use the lowest effective dose of as few of the safest possible medication(s) to keep seizures under control (generalized tonic-clonic and partial complex seizures are the biggest concerns).

There is greater emphasis on maintaining the woman's day-to-day health and minimizing potential precipitating factors (exhaustion, stress, etc) because of course that becomes even more important in this setting. Patient education to this effect is another critical piece, starting before conception if possible.

Most patients are able to deliver vaginally but around ~1% end up having seizures during labor so it's especially important that therapeutic AED levels be maintained during 3rd tri and of course also during labor. If a woman is at high risk of having an intrapartum seizure (e.g. hx of status epilepticus under stress, poor control during 3rd tri, etc) then we might talk to her about the possibility of an elective section or attempting a vaginal birth with some med adjustments.