Possible Syncope or seizure??

My 13 year old daughter and I were standing in the kitchen preparing some lasagna. I glanced over at her and she was looking down and her hair was getting in the food. I asked her what was she doing, and she did not respond. I walked over to her and picked her head up with my hands, calling her name, and she said "What?", "I'm ok". And as I was looking at her, she went completely white, her pupils dialated to the point there was hardly any iris left, and she started to go down. Her eyes were wide open, and she was kind of stiff as I eased her down to the floor, calling her name repeatedly. As soon as she hit the floor, she came to and got up.

I took her to the ER. They did an EKG and some bloodwork. The doctor *thinks* she just passed out, he doesn't feel she had a seizure, but I'm not convinced. He sent her home and said for me to followup with her primary doctor, which I am going to do. I'm just wondering if anyone has had a similar experience and whether you guys think she just fainted or could it have been a seizure?

She did have a febrile seizure when she was 3. Her eyes seemed to be just the same then as they were this time, but there were no convulsions and she turned blue and foamed out of her mouth back then. Also, she was not tired after this event. I know after seizures people usually sleep for a while. My daughter slept for a few hours after the febrile seizure.