Just keep the camera on her cabin whenever you close the tablet and check only the cameras right next to your office. When you don't see her in her cabin anymore or anywhere in the camera just don't open the camera to the left of your office, close the tablet and then press on the camera to the left of your office and after she is done knocking you can open the door again. And on the topic of frequency sometimes when she says something she has a chance to do one of her sequences readying for the run, but I don't know what is the actual chance of it happening.