If it's just a tiny piece a wood, she could've been rooting under a fence, the edge of a shed, even possibly around a tree. I'm glad she has a good prognosis. Many years ago, we had a totally indoor cat that ran outside when a kid came in. She had no experience with the great outdoors and darned if she didn't run straight into a rosebush! She drove a rose thorn completely inside one of her eyes. I could see it like an object in a snow globe. To my amazement, our old country vet not only got the thorn out, but saved the cat's vision. Kitty's name was Trouble and not without reason. :E