Well, someone has to say it: You shouldn't have gone into the woods undergunned.
I've lost them too, it sucks, leaves a horrible feeling in the pit of your stomach. I wounded one last year with a 12ga as well, looked that night, looked the next morning. Never found her. I didn't hunt for a week afterwards I was so upset with myself.
This year I'm bringing a more appropriate gun. Shot at 2 with my 243 so far and got them both. See, it's all about the gun you use.