She's not as invulnerable as Superman, but small arms fire can't hurt her a bit. It just . . . nudges her. A little bit. Enough to be noticeable. And enough to annoy her.
Photoshop artist Kerry Callen rewrites classic comic books to show funny scenes. In the past, he's created animated .gifs of famous covers, depicted Batman as a hoarder, and shown what Superman is trying to do in his first appearance.