Absolutly let her play! seizures can be scary for people who have never seen one, or don't understand them. But I played softball for 10 years, 4 of which I had epilepsy. The best thing you could do is let her live as normal a life as possible. It wouldn't be fair to deny her something she enjoys unless it directly effects the safety of others. Especially because she is so young, and sports at that age are more about
having fun anyway.