[It's good for her that he can't see her face yet because she's doing a lot of mental math right now, and she doesn't need to be guarding her expression while doing that.]

[He saw the "ghost"--and he found her here. She can't reasonably say that she didn't see the thing, so feigning ignorance is out. There's no reason for her to be in the bushes unless she's hiding from something... But that doesn't mean she has to tell the truth about who (or what) she's hiding from.]

Don't be stupid. If I was able to make ghosts, I'd make sure you were haunted night and day.

[She pokes her head out of the bush in order to glower up at him properly. Unfortunately, there's a bit of twig stuck in her hair.]

I'm investigating a ghost sighting, and trying not to get eaten by said ghost. Is that a crime?