Suggest Measures To Control Seizures

Hi! my aunt already undergone eeg, ctscan and ecg and according to the result, everything is normal. she just had another seizure 3 days ago. She had her first seizure 8 yrs ago and the second one was 10 months ago. How can we prevent this and what test do we have to undergo to know the cause of it. Your answers will reaaly be appreciated! thanks!