I had the same think happen to me. Hit a branch and the arrow went right in front of the deer. I watched the deer bound off without looking like it got hit at all. I still waited 20 minutes looking at my arrow stuck in the ground saying to myself "I don't see any blood on that arrow". Got down and the arrow was totally clean. Still went down the path the deer took just to make sure and there was no blood trail.

I have never had a clean arrow after going through a deer so you must have missed her totally.