Don't know if anyone else has suggested this yet, but if she's an indoor cat who uses a box you might try putting her box outside. That way she might smell her smell and know which way to come home. Cats don't generally wander very far, they're just bad with directions if they're used to being indoors, so she might be pretty close by. Every time my parents' cat gets out she's no more than one or two houses away and usually not sure of the way home until she sees them. Also might check with neighbors to look in garages, crawlspaces, basements, etc. We had one once who had wandered into a garage just as the door was closing and nobody knew where he was until the neighbor opened the door again. Good luck.