Nocturnal seizures

Hi, my friend had a nocturnal seizure (while asleep) last september 2023, wasnt allowed to drive for 6 months from the date of the seizure and after mri’s on heart and brain all come back clear so got licence back in the march (6months later). Roll forward this week she has had another nocturnal seizure 14months after the first one. Does anybody know how long she would have to wait to drive again once she has informed the dvla etc?
Thanks