Live and learn. You will be filling those tags in no time. I hit a barbed wife fence once. Sounds just like what you mentioned. I saw a doe about 20 yards in front of me. I draw and make what I expected to be and easy shot. I hear a loud twang and the deer looks back in my direction and trots off with her tail in the air.
You mentined the deer hunched up? The arrow might have been diverted a bit, but it sounds like your arrow is stuck in that deer. Not sure, but from what you have said, she probably ran with it in her. If it has been cool, you still might find her and she still be good. If not, you will get the next one. Good luck.