Last year I had one of my Grey hens fly up after a Cooper and stayed in the air about 15' for over 50 - 60 yards. I caught her and put her in a pen before she jumped on the wrong critter. I have a Murphy hen that jumped on my wife's Chihuahua, one of our German Shepherds, she don't fear anything I believe.
Any offspring out of that grey hen? What do they way as adults?