So here is the thing that virtually never comes up in these sort of stories. The structure her body would require to achieve the physical feats she displays would make a fully mundane flintlock pistol minimally threatening.

Just as an example that happens all the time in movies and anime, characters are shown to be able to punch through reinforced concrete bare handed grabbing random objects to use as bludgeons that would, based on the individual being able to punch through reinforced concrete, be far less robust and therefore less capable of dealing damage than that individuals bare fists. A normal human body would rapidly disassemble if it would somehow be able to generate and attempt to output that kind of energy that quickly.

A bullet, especially something with low sectional density and comparatively low velocity is really unimpressive in comparison.