She wouldn't have known where to go at all if the escort service hadn't told her. There would be evidence of numbers being taken off of the house recently. You know, fading from the sun compared to the fresh area where the numbers were. The guy(s) who "ordered" the night's entertainment would have given the address to the escort service so the service would know where to send the girls. If they didn't think to clean up the evidence (fingernails) they surely wouldn't have thought to take down numbers from the house, would they? What good would THAT do them as they had already given their house number to the service?
Not much.