My first neck shot on a doe today

I've heard all of the pro neck shot talk here on this board and decided I'd take a neck shot on the next doe that presented the opportunity. I had that opportunity today. Her head was down. She was at 90 yds in a clearing. My trigger pull was smooth and my crosshairs were dead on. Mid neck. After the shot I look up and expect her laying there in the dirt immediately. To my absolute astonishment she jumped, gave the hind leg kick, and ran off. I was floored. I was 100% confident in the shot. Regardless I get down with my tags expecting to find her off in the woods some ways. My father and I searched for 3 hrs high and low and found not a single drop of blood. I'm in disbelief and feel sick to my stomach.

I double checked everything at the range Thursday. I was DEAD ON dead on at 100. I've taken a doe at 238 yds before no problem with perfect placement. A 90 yd shot with a scoped rifle should be a layup for anyone. Yet here I am.

I know that most of you are going to say well ya just missed, but I cannot stress enough how confident I was in my trigger pull. She's hit. Is there any other explanation that there wouldn't be any blood from a neck shot? Am I missing something?