Rebel & Bessie

Had to move the bird feeders this am.
Rebel is a bit, ok, A Lot, of a "screw loose...
She might have some problems I've not thought about.
She was Rescued from a horrible hoarding situation in Show Low AZ (there were 2) close to 2 years ago.
She is super sweet. Honestly, probably the sweetest kitty I've had (sorry Alexa)
Still doesn't want to be held, but will sit in my lap or sleep on my head.
She won't eat with Bessie (except for lickable treats in afternoon). They get wet food in the am. Rebel will not eat. She let's Bessie eat and then goes and eats what is left or at least nibble. They have a "holistic" dry constantly available.
She also, sometimes while laying down or sleeping, has what looks like little seizures. I don't know how else to describe it. She tightens up and then relaxes. Her legs, shoulders....
Anyone have any ideas of what could be up?
Could she be inbred? Is that even a thing with cats? Remember it was a hoarding situation.
She was probably 3 or 4 months old when Rescued and then 2 months in a cage😔

It seems the more you learn about cats and sickness, the more you realize you haven't got a clue.
She checks out fine at the vets. Of course she isn't seizing while there...
It probably isn't a big deal, but would love to have more of a clue.

Ok, hope everyone has a great day. Stay blessed

🙋‍♀️😸😺❤❤❤❄

Bessie was adopted from Humane Society & seems quite "normal", for a cat😆 Just a lovable chunky monky🤭