Background information: I have four hens, 2 about a year old, and the other 2 are about 4 years old. We recently built a new coup with a large yard to accommodate the new girls. When we introduced them the new girls were picked on for about 2 weeks, then they all seemed to get along. One new girl in particular, Jane, seems to get picked on much more than the others, and I have seen her get pecked near her comb by all 3 of her coup-mates. She is a bit smaller than the others. Her main bully seems to be one of our older girls, Shelly, who has never been a big fan of Jane. None of the attacks have drawn blood as far as I can tell.
Also, this morning I noticed Jane, after she had just laid her egg for the day, ran out of the coup and seemed to be very alarmed, we didn't see a snake but we are keeping an eye out. She made almost a honking noise at one point.
Should I separate Shelly from the coup for a few days to put her at the bottom of the pecking order?
If anyone can give me any insight to these issues that would be wonderful.
Thanks so much!