She is holding her knife with both her hands. Pointing it to you, the knife looks like it could barely cut butter, and she looks inexperienced with it, her hands are shaking, and she seems nervous.

W-who are you!? What do you want, punk?!?? She says that with a shaky voice.

It is clear that this is all an act she is putting up to not appear weak. A phycological defence mechanism.

You can easily tell she is scared for her life. She doesn't trust you AT ALL, and she seems super insecure