my female cat has been missing now for 3 weeks, i am very worried about her, she is spayed, has always been a indoor/outdoor cat, sleeps inside at nite, seems to have just vanished, i have put up posters, placed add in paper, talked with neighbors, called all shelters, vets, leave out dirty laundry for her just hoping she will recognize scent, i leave out food for her daily/nightly, have searched endlessly for her, can anyone suggest any thing else to do?