My opinion on the whole seizure incident is that is was a giant FAKE, just like all of the other stunts she pulled to get attention. That is why the hospital didn't find ANY medical reason for a Gran Mal seizure to have occurred in a otherwise healthy young lady.
If I had to hazard a guess as to why Casey faked a seizure for Jesse, I would assume that Casey in all of her infinite wisdom thought that if she had a sudden life threatening medical event it would bring her and Jesse closer together. Or Jesse was unhappy with something he had found out about Casey, and the only way to wiggle out of it was to fake a convulsion. Either way, the whole scenario is right up Casey's creepy alley.
For the record, seizures aren't hard to fake. Sadly I had a "friend" years ago who pretended to have Cancer so she could con our group out of money for medical bills. She dropped down on the floor one night and flopped around like a fish on a sharp hook and scared the carp out of all us. Of course we rushed her to the hospital, and lo and behold the truth came out. She was healthy as could be, and the seizure was faked for our benefit. If we hadn't heard all of this from her parents we never would have believed it because she was so convincing. Not to mention the fact that it never occurred to us that ANYONE would fake a convulsion to get attention.
Boy were we wrong!!
So knowing what we all already know about Miss Casey, I personally think this was what happened last year. And if this is accurate, it demonstrates just how far Casey is capable of going to manipulate those around her.
Pretty chilling..