Once, I had a tenant who had a barking dog. The neighbor never talked to them about it, they never talked to me about it, instead they called Code Compliance. They came out, made an assessment, and then sent me (the property owner) a letter saying that complaints had been received, and if the problem was not resolved by such-and-such a date, that I would be fined a couple hundred dollars. As it happened, the tenant had already moved out at this point so the issue had already been resolved.
I was curious how the process worked, though, so I called Code Compliance and asked a series of what-if questions. Long of the short of it is: there’s not much due process. Once they make a determination to fine you, you either pay the fine or face leins. I would think there would be some sort of appeals process, but if there is, it’s pretty damn opaque.
So if the situation really is intractable, you might want to sic Code Compliance on her.