Which hospital?

They should have kept her for observation and done a full septic workup to try and find out the cause of the seizures. Has she been unwell, or had fevers? The kind of sudden fever that causes a febrile convulsion is usually quite plain to see, and they usually cause one seizure, not one after the other.

I would see your GP and push for a referral to a paediatrician to investigate this futher. The kind of seizure you describe, and your daughter's age, does not sound consistent with a run-of-the-mill febrile convulsion to me.