Buffs are my favorite breeds. My smallest buff was flighty and stand-offish until I re-homed a couple of my more aggressive wyandottes. This buff was also the bottom of the pecking order and would run from anything and everyone. She would not even leave the coop for fear of getting beaten up. I spent more time with her, holding at night, made sure she was getting food and water, and generally babied her. She became quite tame very quickly and although I didn't encourage it, she would fly up into my arms when I approached. It was to get away from the others, I am sure.
After the re-homing, I am happy to report she is out and about with the flock, has her confidence back and remains a cuddler. She also started laying again.
I don't know if your buff is at the bottom of the pecking order, but this was my experience.
Anne