I seriously wonder if it was not a true demonic attack, or whatever. she did look possesed. her eyes were bulging out in an impossible way, her voice changed and started yelling nonsense.
What you describe is a fairly typical epileptic seizure. Shouting out nonsensical words, in particular, swear-words or obscene words is Tourette's Syndrome. Unfortunately many JWS are still living in the dark ages when these illnesses were considered demon attack. the victims were often burned at the stake. Today they're just DFed. This happened to the son of our PO whan I was a teen. The PO had to step down.