i'm on board with the rest of your story, it sucks that you fell.
what is completely ridiculous is that it even went through your mind to call the police. I'm pretty sure the LA area cops have more important business than scolding a cleaning lady.
how about taking the high road, i'm sure she didnt realize the hazard of dumping soapy water on the path - i bet she wont do that again after watching you crash. Maybe call her employer as a public service, but certainly not the police...