Cats often come home after extened absences.

Here's a couple tips to increase her chances of finding her way home.

A cats nose is the most important tool.

Place a T shirt, or a sweater you have worn on the porch or doorway.
make sure it is not freshly washed, but rather worn, so it carries your scent.

Walk through the area, calling her, at dawn and dusk. This is when cats are likely to be in search of food, and alert.

Put up flyers and check the shelters daily. (as poor Kuhio was EU'ed at a shelter)

Consider buying a trap, and placing it outside your home, put food, water and the dirty sweater in it. If the weather is inclemant, place blankets over it, for shelter.
Be prepared to trap a cat, but be warned it might not necessarily be yours.

Keep trying.

Cats go missing for weeks, months, even years in some cases.

Good luck