Is this a seizure? If not, what was it?

So, one time I heard a story about how all of a sudden in the middle of mass my cousin’s eyes rolled back and she was arching her back and stayed in that position for a few seconds and when she came to she thought she fell asleep. Is that a seizure and if so, what kind? She doesn’t have any seizure disorder and... show more So, one time I heard a story about how all of a sudden in the middle of mass my cousin’s eyes rolled back and she was arching her back and stayed in that position for a few seconds and when she came to she thought she fell asleep. Is that a seizure and if so, what kind? She doesn’t have any seizure disorder and this never happened again.
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