Had an old doe with a big fawn do that to me the other day. I was in a popup blind, sun at my back, wind in my face, shoot through screens in place, and not moving a muscle, but she still didn't like something about it. She did the staredown, head bob thing for close to 20 minutes. She never gave me a shot, stayed about 25 yards out and quartering hard to me. Finally she just threw up her tail and trotted off. The fawn looked kind of bewildered but soon followed momma.
Those old does didn't get to be old does by being stupid!