“Wait, how is moving her body involuntarily affecting her flight, considering she’s using her brain to do that? Did Regent mess with the nerves in her brain? Can he do that?” I would assume he can mess with at least some of them, considering he can hijack the entire body. But I’m not a neurologist.
Maybe, maybe not. There’s no good reason for his power to not affect the brain when it’s divorced from human ideas, but if he can do that, that’s a form of mind control rather than body control, and he’s been pretty clear on the distinction there.