if it were me, and in the hopes of not receiving a negetive, i would send her an email apologizing that she didn't receive, and send her a new one. i know how hard this is, especially when you're certain that you sent it, but really, in the long run, its better off. ask yourself this...would you rather be constantly reminded of it after seeing that red feedback over and over, or just cut your losses now and send her a new one. you'll forget about it soon enough, and you'll keep your good score.
i know that's more important to me than anything. good luck..
Kat