I found that they hate it when something is above them. My friends would come over and stand above them or try to come at them from above and I would have to explain about coming to their level which always worked. I have one silkie that loves attention and one who does not. Some of my chickens are mellow and some are scary cats. It takes time and as they get older it does get better. Just be patient, don't try to get them to trust you and then grab at them, and do bribe them with treats!