Aside from mechanics, you could simply add cosmetic touches—like a more hunched walking animation when it’s raining, or her flinching at a thunderclap. You could also include idle animations where Sabia shivers because she’s gotten wet.
I've had plans to eventually add more animations for her, mainly different idles and walks when she is less confident in herself. Animation reactions to rain is something I'll put down too, but it probably won't be in the first public alpha version.