The way the city guard has influence is by guarding the city. It's right there in the name.

[You had ONE JOB, etc. etc.]

I'm not especially concerned with what people take kindly to, or what people might do, particularly when there's something that definitely is happening, like there is now. And in case you're new to this entire conversation, which I'm guessing you are, the girl is doing this on purpose. She had to know that her actions would have consequences. Even she isn't that stupid.