Don't lose hope.she could still be nearby. My cat had to of seen her siblings in the windows and I also walk two of them on a leash with my dogs every morning And it still took a bit for her to come back. So don't think she's not nearby just because she hasn't come back yet. Cats are survivalists, THey are smart and resourceful. I don't know if you are or not but I wouldn't leave food out unless your outside, it might bring other animals around and scare her off. Maybe someone picked her up? keep going door to door in your neighborhood to see if anyone has seen her. try looking a little further away to see if anyone put out found cat flyers. I know it's nerve wracking and devastating when a pet is lost, but don't give up. Leave some of her beds and toys with t-shirts with your scent on them, I'm telling you, it works! Good luck