I brought home a new pullet yesterday because she was a lone pullet on a horse/goat/turkey farm. She's a RIR. Not sure how old she is but I think 8 - 10 weeks. I have Spangled Hamburg (3) and Cochin (1) and Ameraucana (1) all over 2 years old, most are 3 years old. Only the Ameraucana is not in my avatar.
While free ranging the back yard yesterday afternoon the hens ignored the baby who found a place to rest in the begonia bed. Later my one S. Hamburg got very aggressive which started the others into a mob. If the S. Hamburg would be less aggressive I think the others would be apt to go through the "normal" peck order jousting.
Last night the baby spent the night in the inner (predator proof) run with a shelter, food and water. The hens went to bed in the coop. I knew baby would never get past SH to get into the coop. This morning I left baby in the inner run and let the others into the outer run. This blocks the laying hens from the nest boxes. I tried putting baby in the outer run with lots of places to hide (cut branches) then open the inner run but SH cornered baby and brutally pecked.
Now baby is in half the outer run which is fenced off from the hens. She has food, water and shelter but can't stay there at night because this part of the run is not predator proof.
Any comments about integration relating to this particular situation would be helpful. She is a real "people bird" looking to me for protection and comfort. I can't (!) let her down.