Prison
Dashing around the giant's body, Shiro continuously pierced him with her spear and bow combo.
While she wasn't able to deal any major damage, she was able to poke a few small holes around his body causing some blood to flow.
Naturally, this annoyed the hell out of the giant as he repeatedly attempted to fry Shiro with his fire breath but Shiro could now save herself every time he did that since she understood that he stayed still when he breathed fire. Which meant that he couldn't shatter her defences with a flex of his muscles during this.
However, while she was running around, she couldn't find a good chance to give him a decent injury since all of her attacks merely poked him a little. She did try to attack his orifices but every time she tried it would be blocked by a wave of his hands.