Flippy, don't worry - just check NA's doorstep.
In all seriousness though, I'm sending good vibes your way and I hope she comes home.
About 10 years ago, I once lost our solid black kitty, Maleficent, for whole 3 days just after I moved. Turns out that she was still inside the apartment, and I never could figure out where she was hiding that whole time, because all boxes were unpacked, and the closets and cabinets were blocked with stuff from those boxes. Hopefully, Nati is just in a good hiding place somewhere, taking a long catnap.
Hugs to you.