Wouldn’t a seizure end with the person collapsing to the floor?
Not necessarily. There are focal & partial seizures and they effect only parts of the brain, start in single or small groups of muscles & can progress or not. Search Jacksonian seizure.
We have clinicians here. They can be more specific.
“Wouldn’t a seizure end with the person collapsing to the floor?”
That would be a classic grand mal seizure.
She appears to be having petite mal or absence seizures. Which can be really dangerous if one is driving or walking up and down stairs.