So, speaking of Isis and why they would hire Ms. Tatro, I went to the scripts. Interestingly she appears to have been a late addition. There's no such character/cat mentioned in the early drafts, but in the final draft there's this.
So, the screen directions called for her to come into the shot and curl up her legs as she seats herself, so they probably hired Tatro as a dancer and contortionist to be able to evoke these graceful feline movements. It's possible this action was filmed and only the shots of her seated remain, but minus film frames that's unprovable.
Roberta trails her words as she sees:
165 ROBERTA’S P.O.V. – ACROSS ROOM 165
A beautiful woman, black hair, sleek black dress, and
jeweled choker necklace, entering the room. She has almost a
feline grace as she sits on the couch, curling her legs up
under her.
Living here will be no threat to your
20th Century moral code, Miss
Lincoln...
jeweled choker necklace, entering the room. She has almost a
feline grace as she sits on the couch, curling her legs up
under her.
SEVEN’S VOICE
20th Century moral code, Miss
Lincoln...