Help! My cat has gone missing! Any tips?

My little sister opened the back door, and forgot to close it. Then my cat, Kendra, ran away. She's been out for about 48 hours, and i still havent found her yet. i am worried sick, because she has nvr been outside before plus she is declawed. Is there any tips? please notify me if you see a solid black cat, with no collar, and yellow/amber eyes. she is female. -Thanks