Lost 2-year-old gray tabby cat named Luna with green eyes and pink collar with bell in backyard in Statesboro.

My cat, Luna, went missing last night from my backyard in Statesboro. She is a 2-year-old gray tabby with green eyes, and she's very friendly but may be scared. I had just let her outside for a bit of fresh air, and she usually comes back in a few minutes, but this time she hasn't returned. I'm really worried and would appreciate any help. She's wearing a pink collar with a small bell and might be hiding nearby.