If it saves one child’s life, it is worth any effort:
http://www.epilepsynse.org.uk/pages/info/leaflets/photo.cfm
I imagine a strobe light would be much worse in her case.
Incidentally, if strobe lights and loud noises can trigger seizures in 3-5% of epileptics, it would seem as if the phenomenon would have been observed quite a bit in discotheques in the '70s (when discos were the craze), and written up in the medical literature then. Offhand, I don't know if it was.