I need advice, while I was on vacation the catsitter lost all of my three cats, this happened Sat I returned home Mon, I am so distraught, we found two of our cats, but one is still missing, bad part she was in heat. I just read to leave the dirty litter tray out which I have done today, still no sign of her, we have left food out, but its not been touched, we live on 4 acres and all the properties are big, so people here really dont turn cats into the shelter cause they think they are barn cats, she has never been an outside cat, so Im really worried. Any suggestions?