Billie shouldn't be struggling with this many emotions to begin with but whether that problem stems from the magic itself or just herself, that's a different problem and not one she's bringing up to Strange. Or anyone, really.

"I can already—" Nope, apparently he's just going to go ahead and show her what he can do. She'll stop there and stay put, since she already wasn't too inclined to get up. She can tell Strange about super-heated weaponry later. "Fine. Let's see."