She'd ahve to wait for a patrol to pass out of sight, before slipping out. She had a few options; she could try to ambush a patrol from behind; that was risky, but had a chance of catching several women at once. She could also sneak into the building, which she hadn't seen the interior of, and hope to find someone, or try to set up an ambush somewhere outside... which, given the late hour, wasn't likely.