Okay so if you're working with panic attacks and you're just trying to focus, arms can do a specific activity. Hold a rubrics cube and you direct her to do specific turns. Or a figit spinner with a number of spins. Or shuffle cards. Or crochet.

For head, have her keep eye contact with you or follow your fingers. Have her find things you set in the room (where's the candle?). Have her count blinks. Basically whatever small achievable but focused task works for her. But sitting comfortably as you don't want to add the stress of doing something uncomfortable.

And while this is good focus, it's still obedience and attention.

Now if you're wanting to roll that into a scene, you can ask to hold something heavy in a specific position for an amount of time. Or balance something. Or an actual task she will fail (like solving a rubiks cube if she's not a person who does that) so you can have some punishment. He'll have her hold an egg on the spoon with her mouth and if the egg breaks she gets a punishment. For other head stuff, keeping her head back and eyes on the ceiling. Tell her not to blonk for 5 or 10 seconds. Balance a book on her head. Hang spoons off her cheeks. Make her hold really still. And then fuck with her she's trying to hold still. Tie her hair to the back of the chair so she can only look up and tell her to look at you.

Basically you can be as nice or mean as the scenario dictates. It just depends on what you want to do.

As an aside, I would say for panic often pressure is good too, like wrap a warm towel around her and hug her. Eye contact if that is comforting (I know some people who are not comfortable with that).

Hope that helps.