Where in the world...

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My youngest cat, Sassy, has gone missing.  The problem?  She wouldn't have gone outside, I wasn't in any of the odd rooms, though I have checked just in case, and I have looked everywhere.  She is not in any of her regular spots, not in any of the windows, not in any of the spare rooms.  I simply cannot figure out where she is or could have gone.  I've looked behind the couches and furniture, under my bed, in the closets, calling to her the whole time.  I have physically looked as well as I can in as many places as are possible in case she is sick.  She didn't even have breakfast this morning, she disappeared before that.    She has never disappeared like this.  She has been left in a room before, but when I call she meows her little head off to be let out.  I am not even sure what to do.  I've looked several times through the day.  Crazy.  I'm a bit worried.