Melissa,
I totally understand your concern and in normal circumstances, I would have left her where she was. However, I live on a very busy street and almost everyone has dogs here. I feel putting her back out in my yard would just sign her death warrant.
My bf found her in my yard and I am amazed that he found her before the dogs did. This is not their usual area to be hanging out in. There are no woods nearby and no fields either. How she got here is a mystery.